diff --git a/Doc/tools/fix_libaux.sed b/Doc/tools/fix_libaux.sed
index 459b7e8d365..fb33cc575de 100755
--- a/Doc/tools/fix_libaux.sed
+++ b/Doc/tools/fix_libaux.sed
@@ -1,3 +1,3 @@
-#! /usr/bin/sed -f
+#! /bin/sed -f
 s/{\\tt  \\hackscore  {}\\hackscore  {}/\\sectcode{__/
 s/\\hackscore  {}\\hackscore  {}/__/