diff --git a/mozilla/lib/mac/NSStdLib/NSStdLib.exp b/mozilla/lib/mac/NSStdLib/NSStdLib.exp
index 19a6082f691..182c9f62834 100644
--- a/mozilla/lib/mac/NSStdLib/NSStdLib.exp
+++ b/mozilla/lib/mac/NSStdLib/NSStdLib.exp
@@ -2,8 +2,8 @@ get__11EnvironmentFPCc		# Environment::get(const char*)
 __dt__11EnvironmentFv		# Environment::~Environment()
 __ct__11EnvironmentFv		# Environment::Environment()
 
-FSRefParentAndFilename_fopen
-FSRef_fopen
+#FSRefParentAndFilename_fopen
+#FSRef_fopen
 FSp_fopen
 __MacOSErrNo
 __aborting
@@ -70,12 +70,12 @@ __logbl
 __logl
 __lower_map
 __modfl
-__msl_get_system_encoding
-__msl_path2fsr
-__msl_path2splitfsr
-__msl_system_has_new_file_apis
-__msl_text2unicode
-__msl_unicode2text
+#__msl_get_system_encoding
+#__msl_path2fsr
+#__msl_path2splitfsr
+#__msl_system_has_new_file_apis
+#__msl_text2unicode
+#__msl_unicode2text
 __nearbyintl
 __nextafterl
 __path2fss
diff --git a/mozilla/lib/mac/NSStdLib/NSStdLibConfig.h b/mozilla/lib/mac/NSStdLib/NSStdLibConfig.h
index e1f18e68da6..1ccafb01dd0 100644
--- a/mozilla/lib/mac/NSStdLib/NSStdLibConfig.h
+++ b/mozilla/lib/mac/NSStdLib/NSStdLibConfig.h
@@ -37,6 +37,8 @@
  
 /* Common defines for both debug & non-debug versions NSStdLib */
 
-/* Nothing to do here */
+#define _MSL_IMP_EXP __declspec(export)
 
-#define _MSL_IMP_EXP __declspec(export)
\ No newline at end of file
+// So we can continue to run on 8.6
+#define _MSL_USE_NEW_FILE_APIS 0
+#define _MSL_USE_OLD_FILE_APIS 1