diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index fab88da0c5e110..e60c6c6f973950 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1842,9 +1842,8 @@ function WebGLRenderer( parameters = {} ) {
 				// are midframe flushes and an external depth buffer. Disable use of the extension.
 				if ( extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true ) {
 
-					console.warn( 'render-to-texture extension was disabled because an external texture was provided' );
-					renderTarget.useRenderToTexture = false;
-					renderTarget.useRenderbuffer = true;
+					console.warn( 'THREE.WebGLRenderer: Render-to-texture extension was disabled because an external texture was provided' );
+					renderTargetProperties.__useRenderToTexture = false;
 
 				}