diff --git a/Playlist/StatusImageTransformer.h b/Playlist/StatusImageTransformer.h
index 969ba9b42..28980a8be 100644
--- a/Playlist/StatusImageTransformer.h
+++ b/Playlist/StatusImageTransformer.h
@@ -9,7 +9,7 @@
 #import <Cocoa/Cocoa.h>
 
 
-@interface StatusImageTransformer : NSObject {
+@interface StatusImageTransformer : NSValueTransformer {
 	NSImage *playImage;
 	NSImage *queueImage;
 	NSImage *errorImage;
diff --git a/Playlist/ToggleQueueTitleTransformer.h b/Playlist/ToggleQueueTitleTransformer.h
index 02908cea1..c47bd73a4 100644
--- a/Playlist/ToggleQueueTitleTransformer.h
+++ b/Playlist/ToggleQueueTitleTransformer.h
@@ -9,7 +9,7 @@
 #import <Cocoa/Cocoa.h>
 
 
-@interface ToggleQueueTitleTransformer : NSObject {
+@interface ToggleQueueTitleTransformer : NSValueTransformer {
 
 }