diff --git a/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp b/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
index deb9a9ad680..33217f601dc 100644
--- a/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
+++ b/mozilla/extensions/java/xpcom/tools/genifaces/GenerateJavaInterfaces.cpp
@@ -48,6 +48,7 @@
 #include "nsHashKeys.h"
 #include "nsIWeakReference.h"
 #include <stdio.h>
+#include <ctype.h>
 
 #ifdef WIN32
 #define snprintf  _snprintf