diff --git a/src/ol/index.js b/src/ol/index.js
index 04be982456..c82cf5a2ae 100644
--- a/src/ol/index.js
+++ b/src/ol/index.js
@@ -5,12 +5,6 @@
 import webgl from './webgl.js';
 
 
-/**
- * @type {string} Default WMS version.
- */
-export var DEFAULT_WMS_VERSION = '1.3.0';
-
-
 /**
  * @type {boolean} Include debuggable shader sources.  Default is `true`.
  *     This should be set to `false` for production builds.
@@ -128,7 +122,6 @@ export default {
   nullFunction: nullFunction,
   inherits: inherits,
   VERSION: VERSION,
-  DEFAULT_WMS_VERSION: DEFAULT_WMS_VERSION,
   DEBUG_WEBGL: DEBUG_WEBGL,
   HAS_WEBGL: HAS_WEBGL,
   WEBGL_MAX_TEXTURE_SIZE: WEBGL_MAX_TEXTURE_SIZE,
diff --git a/src/ol/source/ImageWMS.js b/src/ol/source/ImageWMS.js
index 74a7d46274..98fa89fab9 100644
--- a/src/ol/source/ImageWMS.js
+++ b/src/ol/source/ImageWMS.js
@@ -2,7 +2,8 @@
  * @module ol/source/ImageWMS
  */
 
-import {DEFAULT_WMS_VERSION, inherits} from '../index.js';
+import {DEFAULT_WMS_VERSION} from './common.js';
+import {inherits} from '../index.js';
 import _ol_Image_ from '../Image.js';
 import _ol_asserts_ from '../asserts.js';
 import _ol_events_ from '../events.js';
diff --git a/src/ol/source/TileWMS.js b/src/ol/source/TileWMS.js
index 1a63818b98..a03a4f718e 100644
--- a/src/ol/source/TileWMS.js
+++ b/src/ol/source/TileWMS.js
@@ -2,7 +2,8 @@
  * @module ol/source/TileWMS
  */
 
-import {DEFAULT_WMS_VERSION, inherits} from '../index.js';
+import {DEFAULT_WMS_VERSION} from './common.js';
+import {inherits} from '../index.js';
 import _ol_asserts_ from '../asserts.js';
 import _ol_extent_ from '../extent.js';
 import _ol_obj_ from '../obj.js';
diff --git a/src/ol/source/common.js b/src/ol/source/common.js
new file mode 100644
index 0000000000..a20bbd8c85
--- /dev/null
+++ b/src/ol/source/common.js
@@ -0,0 +1,4 @@
+/**
+ * @type {string} Default WMS version.
+ */
+export var DEFAULT_WMS_VERSION = '1.3.0';