diff --git a/src/renderers/common/extras/PMREMGenerator.js b/src/renderers/common/extras/PMREMGenerator.js
index 2884be18d7a37d..5cb254c865ee46 100644
--- a/src/renderers/common/extras/PMREMGenerator.js
+++ b/src/renderers/common/extras/PMREMGenerator.js
@@ -339,15 +339,7 @@ class PMREMGenerator {
 
 	_fromTexture( texture, renderTarget ) {
 
-		if ( texture.mapping === CubeReflectionMapping || texture.mapping === CubeRefractionMapping ) {
-
-			this._setSize( texture.image.length === 0 ? 16 : ( texture.image[ 0 ].width || texture.image[ 0 ].image.width ) );
-
-		} else { // Equirectangular
-
-			this._setSize( texture.image.width / 4 );
-
-		}
+		this._setSizeFromTexture( texture );
 
 		_oldTarget = this._renderer.getRenderTarget();
 		_oldActiveCubeFace = this._renderer.getActiveCubeFace();