diff --git a/mozilla/xpcom/base/nsDebug.cpp b/mozilla/xpcom/base/nsDebug.cpp
index 023679542ea..724664b103d 100644
--- a/mozilla/xpcom/base/nsDebug.cpp
+++ b/mozilla/xpcom/base/nsDebug.cpp
@@ -138,7 +138,7 @@ NS_COM void nsDebug::AbortIfFalse(const char* aStr, const char* aExpr,
   PR_Abort();
 #endif
 #elif defined(XP_MAC)
-  DebugStr(buffer);
+  DebugStr(buf);
   ExitToShell();
 #elif defined(XP_UNIX)
   PR_Abort();
diff --git a/mozilla/xpcom/glue/nsDebug.cpp b/mozilla/xpcom/glue/nsDebug.cpp
index 023679542ea..724664b103d 100644
--- a/mozilla/xpcom/glue/nsDebug.cpp
+++ b/mozilla/xpcom/glue/nsDebug.cpp
@@ -138,7 +138,7 @@ NS_COM void nsDebug::AbortIfFalse(const char* aStr, const char* aExpr,
   PR_Abort();
 #endif
 #elif defined(XP_MAC)
-  DebugStr(buffer);
+  DebugStr(buf);
   ExitToShell();
 #elif defined(XP_UNIX)
   PR_Abort();