diff --git a/src/mac/carbon/dc.cpp b/src/mac/carbon/dc.cpp
index 4e570147ca..5fd016f985 100644
--- a/src/mac/carbon/dc.cpp
+++ b/src/mac/carbon/dc.cpp
@@ -24,6 +24,7 @@
 
 #if __MSL__ >= 0x6000
 #include "math.h"
+namespace std {}
 using namespace std ;
 #endif