diff --git a/modules/plugin/base/src/nsPluginHost.cpp b/modules/plugin/base/src/nsPluginHost.cpp
index da3d7e777773..45f4464b4ba1 100644
--- a/modules/plugin/base/src/nsPluginHost.cpp
+++ b/modules/plugin/base/src/nsPluginHost.cpp
@@ -225,6 +225,8 @@ PRLogModuleInfo* nsPluginLogging::gPluginLog = nsnull;
 
 #define MAGIC_REQUEST_CONTEXT 0x01020304
 
+nsresult PostPluginUnloadEvent(PRLibrary * aLibrary);
+
 static nsPluginInstanceTagList *gActivePluginList;
 
 #ifdef CALL_SAFETY_ON