diff --git a/intl/uconv/src/nsMacCharset.cpp b/intl/uconv/src/nsMacCharset.cpp
index 434ba3fe857..e8ac92a3cf5 100644
--- a/intl/uconv/src/nsMacCharset.cpp
+++ b/intl/uconv/src/nsMacCharset.cpp
@@ -48,6 +48,7 @@
 #include "nsLocaleCID.h"
 #include "nsReadableUtils.h"
 #include "nsPlatformCharset.h"
+#include "nsEncoderDecoderUtils.h"
 
 static nsURLProperties *gInfo = nsnull;
 static PRInt32 gCnt = 0;