diff --git a/mailnews/base/src/nsMsgFolderCache.h b/mailnews/base/src/nsMsgFolderCache.h
index a14541d21056..5b62502477d1 100644
--- a/mailnews/base/src/nsMsgFolderCache.h
+++ b/mailnews/base/src/nsMsgFolderCache.h
@@ -28,7 +28,7 @@
 
 #include "nsCOMPtr.h"
 #include "mdb.h"
-#include "nsHashTable.h"
+#include "nsHashtable.h"
 
 class FolderCachePool;