diff --git a/mozilla/layout/mathml/content/src/mathml-css.pl b/mozilla/layout/mathml/content/src/mathml-css.pl
index 945e2138cbd..13a464e44a3 100644
--- a/mozilla/layout/mathml/content/src/mathml-css.pl
+++ b/mozilla/layout/mathml/content/src/mathml-css.pl
@@ -10,6 +10,7 @@ close(UA);
 
 if (!($css =~ m|\@import.*mathml\.css|)) 
 {
+  $css =~ s/\cM\n/\n/g; # dos2unix end of line
   $css =~ s|(\@import[^\@]+\;)\n\n|$1\n\@import url\(resource:/res/mathml\.css\);\n\n|;
   open(UA, ">$ua");
   print UA $css;