diff --git a/mozilla/xpfe/bootstrap/nsAppRunner.cpp b/mozilla/xpfe/bootstrap/nsAppRunner.cpp
index 930bce10cb7..f6cf85a3990 100644
--- a/mozilla/xpfe/bootstrap/nsAppRunner.cpp
+++ b/mozilla/xpfe/bootstrap/nsAppRunner.cpp
@@ -478,9 +478,11 @@ static nsresult Ensure1Window( nsICmdLineService* cmdLineArgs)
 }
 
 #ifdef DEBUG_warren
+#ifdef XP_PC
 #define _CRTDBG_MAP_ALLOC
 #include <crtdbg.h>
 #endif
+#endif
 
 static nsresult main1(int argc, char* argv[])
 {