diff --git a/mozilla/xpcom/ds/nsCppSharedAllocator.h b/mozilla/xpcom/ds/nsCppSharedAllocator.h
index f705f6f489b..c84fdb4ec21 100644
--- a/mozilla/xpcom/ds/nsCppSharedAllocator.h
+++ b/mozilla/xpcom/ds/nsCppSharedAllocator.h
@@ -3,6 +3,7 @@
 
 #include "nsIAllocator.h" // for |nsAllocator|
 #include "nscore.h"       // for |NS_XXX_CAST|
+#include <new.h>					// to allow placement |new|
 
 
   // under Metrowerks (Mac), we don't have autoconf yet
@@ -72,18 +73,11 @@ class nsCppSharedAllocator
           nsAllocator::Free(p);
         }
 
-#if 0
-				/*
-					Hmmm.  Some platforms don't seem to have placement |new|.  I'll comment this out
-					temporarily until I can come up with a fix.
-				*/
-
       void
       construct( pointer p, const T& val )
         {
           new (p) T(val);
         }
-#endif
       
       void
       destroy( pointer p )