diff --git a/auto/bin/fix_OML_sync_control.sh b/auto/bin/fix_OML_sync_control.sh
index da70bee..f83a0fe 100755
--- a/auto/bin/fix_OML_sync_control.sh
+++ b/auto/bin/fix_OML_sync_control.sh
@@ -6,7 +6,7 @@
 # General Public License Version 2 as published by the Free Software
 # Foundation or, at your option, any later version.
 
-sed -e 's/#ifndef GLX_OML_sync_control/#if !defined(GLX_OML_sync_control) \&\& defined(__STDC_VERSION__) \&\& (__STDC_VERSION__ >= 199901L)\n#include <inttypes.h>/' $1 > tmp
-mv tmp $1
-sed -e 's/#ifdef GLX_OML_sync_control/#if defined(GLX_OML_sync_control) \&\& defined(__STDC_VERSION__) \&\& (__STDC_VERSION__ >= 199901L)\n#include <inttypes.h>/' $1 > tmp
-mv tmp $1
+perl -e 's/#ifndef GLX_OML_sync_control/#if !defined(GLX_OML_sync_control) \&\& defined(__STDC_VERSION__) \&\& (__STDC_VERSION__ >= 199901L)\n#include <inttypes.h>/;' -pi.bak $1
+rm -f $1.bak
+perl -e 's/#ifdef GLX_OML_sync_control/#if defined(GLX_OML_sync_control) \&\& defined(__STDC_VERSION__) \&\& (__STDC_VERSION__ >= 199901L)\n#include <inttypes.h>/;' -pi.bak $1
+rm -f $1.bak