diff --git a/android-skin-loader-lib/src/main/java/cn/feng/skin/manager/loader/SkinManager.java b/android-skin-loader-lib/src/main/java/cn/feng/skin/manager/loader/SkinManager.java
index fb5f7c7..55a97ea 100644
--- a/android-skin-loader-lib/src/main/java/cn/feng/skin/manager/loader/SkinManager.java
+++ b/android-skin-loader-lib/src/main/java/cn/feng/skin/manager/loader/SkinManager.java
@@ -200,7 +200,8 @@ public void attach(ISkinUpdate observer) {
 		if(skinObservers == null){
 			skinObservers = new ArrayList<ISkinUpdate>();
 		}
-		if(!skinObservers.contains(skinObservers)){
+		// a bug
+		if(!skinObservers.contains(observer)){
 			skinObservers.add(observer);
 		}
 	}
@@ -323,4 +324,4 @@ public ColorStateList convertToColorStateList(int resId) {
 		int[][] states = new int[1][1];
 		return new ColorStateList(states, new int[] { context.getResources().getColor(resId) });
 	}
-}
\ No newline at end of file
+}