diff --git a/js/xpconnect/loader/mozJSComponentLoader.h b/js/xpconnect/loader/mozJSComponentLoader.h
index 22a39c68b141..f11e9da9dfcd 100644
--- a/js/xpconnect/loader/mozJSComponentLoader.h
+++ b/js/xpconnect/loader/mozJSComponentLoader.h
@@ -23,8 +23,6 @@
 #include "xpcpublic.h"
 
 class nsIFile;
-class nsIPrincipal;
-class nsIXPConnectJSObjectHolder;
 class ComponentLoaderInfo;
 
 namespace mozilla {
diff --git a/storage/mozStorageStatement.h b/storage/mozStorageStatement.h
index 57e6f848c9d9..87c165a1247d 100644
--- a/storage/mozStorageStatement.h
+++ b/storage/mozStorageStatement.h
@@ -19,7 +19,6 @@
 #include "StorageBaseStatementInternal.h"
 #include "mozilla/Attributes.h"
 
-class nsIXPConnectJSObjectHolder;
 struct sqlite3_stmt;
 
 namespace mozilla {