diff --git a/src/ol/source/source.js b/src/ol/source/source.js
index 5145c95f31..9a4db1b021 100644
--- a/src/ol/source/source.js
+++ b/src/ol/source/source.js
@@ -220,12 +220,3 @@ ol.source.Source.prototype.setState = function(state) {
   this.state_ = state;
   this.changed();
 };
-
-
-/**
- * Set the projection of the source.
- * @param {ol.proj.Projection} projection Projection.
- */
-ol.source.Source.prototype.setProjection = function(projection) {
-  this.projection_ = projection;
-};