diff --git a/mozilla/extensions/schema-validation/src/nsSchemaPrivate.h b/mozilla/extensions/schema-validation/src/nsSchemaPrivate.h
index 59de9e5bed6..84c4e525060 100644
--- a/mozilla/extensions/schema-validation/src/nsSchemaPrivate.h
+++ b/mozilla/extensions/schema-validation/src/nsSchemaPrivate.h
@@ -51,6 +51,8 @@
 #include "nsStringAPI.h"
 #include "nsIDOMElement.h"
 
+#include <stdio.h>
+
 #define NS_SCHEMA_2001_NAMESPACE "http://www.w3.org/2001/XMLSchema"
 #define NS_SCHEMA_1999_NAMESPACE "http://www.w3.org/1999/XMLSchema"
 #define NS_SOAP_1_1_ENCODING_NAMESPACE \