diff --git a/src/ol/geom/LineString.js b/src/ol/geom/LineString.js
index beb3d7a8df..a219e6e8a6 100644
--- a/src/ol/geom/LineString.js
+++ b/src/ol/geom/LineString.js
@@ -10,7 +10,7 @@ import SimpleGeometry from '../geom/SimpleGeometry.js';
 import {assignClosestPoint, maxSquaredDelta} from '../geom/flat/closest.js';
 import {deflateCoordinates} from '../geom/flat/deflate.js';
 import {inflateCoordinates} from '../geom/flat/inflate.js';
-import _ol_geom_flat_interpolate_ from '../geom/flat/interpolate.js';
+import {interpolatePoint, lineStringCoordinateAtM} from '../geom/flat/interpolate.js';
 import _ol_geom_flat_intersectsextent_ from '../geom/flat/intersectsextent.js';
 import {lineStringLength} from '../geom/flat/length.js';
 import {forEach as forEachSegment} from '../geom/flat/segments.js';
@@ -143,7 +143,7 @@ LineString.prototype.getCoordinateAtM = function(m, opt_extrapolate) {
     return null;
   }
   const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
-  return _ol_geom_flat_interpolate_.lineStringCoordinateAtM(this.flatCoordinates, 0,
+  return lineStringCoordinateAtM(this.flatCoordinates, 0,
     this.flatCoordinates.length, this.stride, m, extrapolate);
 };
 
@@ -171,7 +171,7 @@ LineString.prototype.getCoordinates = function() {
  * @api
  */
 LineString.prototype.getCoordinateAt = function(fraction, opt_dest) {
-  return _ol_geom_flat_interpolate_.lineString(
+  return interpolatePoint(
     this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
     fraction, opt_dest);
 };
diff --git a/src/ol/geom/MultiLineString.js b/src/ol/geom/MultiLineString.js
index 7d4e8d1106..dc6a07193f 100644
--- a/src/ol/geom/MultiLineString.js
+++ b/src/ol/geom/MultiLineString.js
@@ -11,7 +11,7 @@ import SimpleGeometry from '../geom/SimpleGeometry.js';
 import {assignClosestArrayPoint, arrayMaxSquaredDelta} from '../geom/flat/closest.js';
 import {deflateCoordinatesArray} from '../geom/flat/deflate.js';
 import {inflateCoordinatesArray} from '../geom/flat/inflate.js';
-import _ol_geom_flat_interpolate_ from '../geom/flat/interpolate.js';
+import {interpolatePoint, lineStringsCoordinateAtM} from '../geom/flat/interpolate.js';
 import _ol_geom_flat_intersectsextent_ from '../geom/flat/intersectsextent.js';
 import {douglasPeuckerArray} from '../geom/flat/simplify.js';
 
@@ -132,7 +132,7 @@ MultiLineString.prototype.getCoordinateAtM = function(m, opt_extrapolate, opt_in
   }
   const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
   const interpolate = opt_interpolate !== undefined ? opt_interpolate : false;
-  return _ol_geom_flat_interpolate_.lineStringsCoordinateAtM(this.flatCoordinates, 0,
+  return lineStringsCoordinateAtM(this.flatCoordinates, 0,
     this.ends_, this.stride, m, extrapolate, interpolate);
 };
 
@@ -208,7 +208,7 @@ MultiLineString.prototype.getFlatMidpoints = function() {
   const stride = this.stride;
   for (let i = 0, ii = ends.length; i < ii; ++i) {
     const end = ends[i];
-    const midpoint = _ol_geom_flat_interpolate_.lineString(
+    const midpoint = interpolatePoint(
       flatCoordinates, offset, end, stride, 0.5);
     extend(midpoints, midpoint);
     offset = end;
diff --git a/src/ol/geom/flat/interpolate.js b/src/ol/geom/flat/interpolate.js
index 04d238fa83..37aa638bc3 100644
--- a/src/ol/geom/flat/interpolate.js
+++ b/src/ol/geom/flat/interpolate.js
@@ -3,7 +3,6 @@
  */
 import {binarySearch} from '../../array.js';
 import {lerp} from '../../math.js';
-const _ol_geom_flat_interpolate_ = {};
 
 
 /**
@@ -15,7 +14,7 @@ const _ol_geom_flat_interpolate_ = {};
  * @param {Array.<number>=} opt_dest Destination.
  * @return {Array.<number>} Destination.
  */
-_ol_geom_flat_interpolate_.lineString = function(flatCoordinates, offset, end, stride, fraction, opt_dest) {
+export function interpolatePoint(flatCoordinates, offset, end, stride, fraction, opt_dest) {
   let pointX = NaN;
   let pointY = NaN;
   const n = (end - offset) / stride;
@@ -62,7 +61,7 @@ _ol_geom_flat_interpolate_.lineString = function(flatCoordinates, offset, end, s
   } else {
     return [pointX, pointY];
   }
-};
+}
 
 
 /**
@@ -74,7 +73,7 @@ _ol_geom_flat_interpolate_.lineString = function(flatCoordinates, offset, end, s
  * @param {boolean} extrapolate Extrapolate.
  * @return {ol.Coordinate} Coordinate.
  */
-_ol_geom_flat_interpolate_.lineStringCoordinateAtM = function(flatCoordinates, offset, end, stride, m, extrapolate) {
+export function lineStringCoordinateAtM(flatCoordinates, offset, end, stride, m, extrapolate) {
   if (end == offset) {
     return null;
   }
@@ -123,7 +122,7 @@ _ol_geom_flat_interpolate_.lineStringCoordinateAtM = function(flatCoordinates, o
   }
   coordinate.push(m);
   return coordinate;
-};
+}
 
 
 /**
@@ -136,10 +135,10 @@ _ol_geom_flat_interpolate_.lineStringCoordinateAtM = function(flatCoordinates, o
  * @param {boolean} interpolate Interpolate.
  * @return {ol.Coordinate} Coordinate.
  */
-_ol_geom_flat_interpolate_.lineStringsCoordinateAtM = function(
+export function lineStringsCoordinateAtM(
   flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {
   if (interpolate) {
-    return _ol_geom_flat_interpolate_.lineStringCoordinateAtM(
+    return lineStringCoordinateAtM(
       flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);
   }
   let coordinate;
@@ -169,11 +168,10 @@ _ol_geom_flat_interpolate_.lineStringsCoordinateAtM = function(
     if (m < flatCoordinates[offset + stride - 1]) {
       return null;
     } else if (m <= flatCoordinates[end - 1]) {
-      return _ol_geom_flat_interpolate_.lineStringCoordinateAtM(
+      return lineStringCoordinateAtM(
         flatCoordinates, offset, end, stride, m, false);
     }
     offset = end;
   }
   return null;
-};
-export default _ol_geom_flat_interpolate_;
+}
diff --git a/src/ol/render/Feature.js b/src/ol/render/Feature.js
index f72aa7c40f..97450de4c5 100644
--- a/src/ol/render/Feature.js
+++ b/src/ol/render/Feature.js
@@ -7,7 +7,7 @@ import {createOrUpdateFromCoordinate, createOrUpdateFromFlatCoordinates, getCent
 import GeometryType from '../geom/GeometryType.js';
 import {linearRingss as linearRingssCenter} from '../geom/flat/center.js';
 import {getInteriorPointOfArray, getInteriorPointsOfMultiArray} from '../geom/flat/interiorpoint.js';
-import _ol_geom_flat_interpolate_ from '../geom/flat/interpolate.js';
+import {interpolatePoint} from '../geom/flat/interpolate.js';
 import _ol_geom_flat_transform_ from '../geom/flat/transform.js';
 import _ol_transform_ from '../transform.js';
 
@@ -151,7 +151,7 @@ RenderFeature.prototype.getFlatInteriorPoints = function() {
  */
 RenderFeature.prototype.getFlatMidpoint = function() {
   if (!this.flatMidpoints_) {
-    this.flatMidpoints_ = _ol_geom_flat_interpolate_.lineString(
+    this.flatMidpoints_ = interpolatePoint(
       this.flatCoordinates_, 0, this.flatCoordinates_.length, 2, 0.5);
   }
   return this.flatMidpoints_;
@@ -169,7 +169,7 @@ RenderFeature.prototype.getFlatMidpoints = function() {
     const ends = this.ends_;
     for (let i = 0, ii = ends.length; i < ii; ++i) {
       const end = ends[i];
-      const midpoint = _ol_geom_flat_interpolate_.lineString(
+      const midpoint = interpolatePoint(
         flatCoordinates, offset, end, 2, 0.5);
       extend(this.flatMidpoints_, midpoint);
       offset = end;
diff --git a/test/spec/ol/geom/flat/interpolate.test.js b/test/spec/ol/geom/flat/interpolate.test.js
index a8ca28830e..ae65f9e7e6 100644
--- a/test/spec/ol/geom/flat/interpolate.test.js
+++ b/test/spec/ol/geom/flat/interpolate.test.js
@@ -1,4 +1,4 @@
-import _ol_geom_flat_interpolate_ from '../../../../../src/ol/geom/flat/interpolate.js';
+import {interpolatePoint} from '../../../../../src/ol/geom/flat/interpolate.js';
 
 
 describe('ol.geom.flat.interpolate', function() {
@@ -8,14 +8,14 @@ describe('ol.geom.flat.interpolate', function() {
     it('returns the expected value for single points', function() {
       const flatCoordinates = [0, 1];
       const point =
-          _ol_geom_flat_interpolate_.lineString(flatCoordinates, 0, 2, 2, 0.5);
+          interpolatePoint(flatCoordinates, 0, 2, 2, 0.5);
       expect(point).to.eql([0, 1]);
     });
 
     it('returns the expected value for simple line segments', function() {
       const flatCoordinates = [0, 1, 2, 3];
       const point =
-          _ol_geom_flat_interpolate_.lineString(flatCoordinates, 0, 4, 2, 0.5);
+          interpolatePoint(flatCoordinates, 0, 4, 2, 0.5);
       expect(point).to.eql([1, 2]);
     });
 
@@ -23,14 +23,14 @@ describe('ol.geom.flat.interpolate', function() {
         'coordinate',
     function() {
       const flatCoordinates = [0, 1, 2, 3, 4, 5];
-      const point = _ol_geom_flat_interpolate_.lineString(
+      const point = interpolatePoint(
         flatCoordinates, 0, 6, 2, 0.5);
       expect(point).to.eql([2, 3]);
     });
 
     xit('also when vertices are repeated', function() {
       const flatCoordinates = [0, 1, 2, 3, 2, 3, 4, 5];
-      const point = _ol_geom_flat_interpolate_.lineString(
+      const point = interpolatePoint(
         flatCoordinates, 0, 6, 2, 0.5);
       expect(point).to.eql([2, 3]);
     });
@@ -39,14 +39,14 @@ describe('ol.geom.flat.interpolate', function() {
         'two existing coordinates',
     function() {
       const flatCoordinates = [0, 1, 2, 3, 4, 5, 6, 7];
-      const point = _ol_geom_flat_interpolate_.lineString(
+      const point = interpolatePoint(
         flatCoordinates, 0, 8, 2, 0.5);
       expect(point).to.eql([3, 4]);
     });
 
     xit('also when vertices are repeated', function() {
       const flatCoordinates = [0, 1, 2, 3, 2, 3, 4, 5, 6, 7];
-      const point = _ol_geom_flat_interpolate_.lineString(
+      const point = interpolatePoint(
         flatCoordinates, 0, 8, 2, 0.5);
       expect(point).to.eql([3, 4]);
     });
@@ -54,7 +54,7 @@ describe('ol.geom.flat.interpolate', function() {
     it('returns the expected value when the coordinates are not evenly spaced',
       function() {
         const flatCoordinates = [0, 1, 2, 3, 6, 7];
-        const point = _ol_geom_flat_interpolate_.lineString(
+        const point = interpolatePoint(
           flatCoordinates, 0, 6, 2, 0.5);
         expect(point).to.eql([3, 4]);
       });
@@ -62,7 +62,7 @@ describe('ol.geom.flat.interpolate', function() {
     xit('also when vertices are repeated',
       function() {
         const flatCoordinates = [0, 1, 2, 3, 2, 3, 6, 7];
-        const point = _ol_geom_flat_interpolate_.lineString(
+        const point = interpolatePoint(
           flatCoordinates, 0, 6, 2, 0.5);
         expect(point).to.eql([3, 4]);
       });
@@ -70,7 +70,7 @@ describe('ol.geom.flat.interpolate', function() {
     it('returns the expected value when using opt_dest',
       function() {
         const flatCoordinates = [0, 1, 2, 3, 6, 7];
-        const point = _ol_geom_flat_interpolate_.lineString(
+        const point = interpolatePoint(
           flatCoordinates, 0, 6, 2, 0.5, [0, 0]);
         expect(point).to.eql([3, 4]);
       });