diff --git a/view/public/nsIViewObserver.h b/view/public/nsIViewObserver.h
index 41dc700d88f..706768cf552 100644
--- a/view/public/nsIViewObserver.h
+++ b/view/public/nsIViewObserver.h
@@ -47,8 +47,8 @@ class nsIRenderingContext;
 class nsGUIEvent;
 
 #define NS_IVIEWOBSERVER_IID  \
-  { 0xc5dfb460, 0x50fb, 0x483e, \
-    { 0xb4, 0x22, 0x19, 0xb7, 0x20, 0x4f, 0xe2, 0xdc } } //xxx
+  { 0x6af699da, 0x8bfe, 0x43c9, \
+    { 0xae, 0xc1, 0x76, 0x1b, 0x03, 0x62, 0x8d, 0x64 } }
 
 class nsIViewObserver : public nsISupports
 {