diff --git a/src/ResourcesLive/RlImage.class.st b/src/ResourcesLive/RlImage.class.st
index 9598481..e9b8bea 100644
--- a/src/ResourcesLive/RlImage.class.st
+++ b/src/ResourcesLive/RlImage.class.st
@@ -7,7 +7,7 @@ Class {
 { #category : #testing }
 RlImage class >> isClassFor: file [
 	"I'm abstract"
-	^ self ~= RlImage
+	^ self ~= RlImage and: [ super isClassFor: file ]
 ]
 
 { #category : #accessing }