diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl
index c09c3216add8c9f12d7a5b788d0893e88a3faf5c..25f8c4e83fab3d31ac60b8d1304c79a6b97cedd1 100755
--- a/crypto/perlasm/x86_64-xlate.pl
+++ b/crypto/perlasm/x86_64-xlate.pl
@@ -241,8 +241,9 @@ my %globals;
 
 	if ($gas) {
 	    # Solaris /usr/ccs/bin/as can't handle multiplications
-	    # in $self->{label}
-	    $self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
+	    # in $self->{label}, new gas requires sign extension...
+	    use integer;
+	    $self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)<<32>>32/egi;
 	    $self->{label} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
 	    $self->{label} =~ s/^___imp_/__imp__/   if ($flavour eq "mingw64");