diff --git a/mozilla/expat/xmlparse/xmlparse.h b/mozilla/expat/xmlparse/xmlparse.h
index e9c79d0df7a..b34617aab82 100644
--- a/mozilla/expat/xmlparse/xmlparse.h
+++ b/mozilla/expat/xmlparse/xmlparse.h
@@ -107,7 +107,7 @@ typedef void (*XML_ProcessingInstructionHandler)(void *userData,
 /* data is 0 terminated */
 typedef void (*XML_CommentHandler)(void *userData, const XML_Char *data);
 
-//#define EXTERNAL_ENTITY_SUPPORT
+/* #define EXTERNAL_ENTITY_SUPPORT */
 #ifdef EXTERNAL_ENTITY_SUPPORT
 typedef int (*XML_ExternalDTDLoader)(const XML_Char * base, 
                                      const XML_Char * systemId,
diff --git a/mozilla/expat/xmltok/xmlrole.h b/mozilla/expat/xmltok/xmlrole.h
index b5d18373048..28b245698f6 100644
--- a/mozilla/expat/xmltok/xmlrole.h
+++ b/mozilla/expat/xmltok/xmlrole.h
@@ -91,7 +91,7 @@ typedef struct prolog_state {
 
 void XMLTOKAPI XmlPrologStateInit(PROLOG_STATE *);
 
-//#define EXTERNAL_ENTITY_SUPPORT
+/* #define EXTERNAL_ENTITY_SUPPORT */
 #ifdef EXTERNAL_ENTITY_SUPPORT
 void XMLTOKAPI XmlPrologStateHack(PROLOG_STATE *);
 #endif
diff --git a/mozilla/parser/expat/lib/xmlparse.h b/mozilla/parser/expat/lib/xmlparse.h
index e9c79d0df7a..b34617aab82 100644
--- a/mozilla/parser/expat/lib/xmlparse.h
+++ b/mozilla/parser/expat/lib/xmlparse.h
@@ -107,7 +107,7 @@ typedef void (*XML_ProcessingInstructionHandler)(void *userData,
 /* data is 0 terminated */
 typedef void (*XML_CommentHandler)(void *userData, const XML_Char *data);
 
-//#define EXTERNAL_ENTITY_SUPPORT
+/* #define EXTERNAL_ENTITY_SUPPORT */
 #ifdef EXTERNAL_ENTITY_SUPPORT
 typedef int (*XML_ExternalDTDLoader)(const XML_Char * base, 
                                      const XML_Char * systemId,
diff --git a/mozilla/parser/expat/lib/xmlrole.h b/mozilla/parser/expat/lib/xmlrole.h
index b5d18373048..28b245698f6 100644
--- a/mozilla/parser/expat/lib/xmlrole.h
+++ b/mozilla/parser/expat/lib/xmlrole.h
@@ -91,7 +91,7 @@ typedef struct prolog_state {
 
 void XMLTOKAPI XmlPrologStateInit(PROLOG_STATE *);
 
-//#define EXTERNAL_ENTITY_SUPPORT
+/* #define EXTERNAL_ENTITY_SUPPORT */
 #ifdef EXTERNAL_ENTITY_SUPPORT
 void XMLTOKAPI XmlPrologStateHack(PROLOG_STATE *);
 #endif