diff --git a/src/renderers/common/RenderObject.js b/src/renderers/common/RenderObject.js
index dd7d3ac40af473..0a670f8e57192a 100644
--- a/src/renderers/common/RenderObject.js
+++ b/src/renderers/common/RenderObject.js
@@ -566,7 +566,7 @@ class RenderObject {
 
 			const targets = geometry.morphAttributes[ name ];
 
-			cacheKey += name + ',';
+			cacheKey += 'morph-' + name + ',';
 
 			for ( let i = 0, l = targets.length; i < l; i ++ ) {