diff --git a/fhem/contrib/pre-commit b/fhem/contrib/pre-commit
index 8c19cc396..beb22327d 100755
--- a/fhem/contrib/pre-commit
+++ b/fhem/contrib/pre-commit
@@ -55,6 +55,9 @@ foreach my $row (split("\n", $fList)) {
     next;
   }
   
+  err $fName, "filename contains strange characters (not A-Za-z0-9_.-%)"
+    if($fName =~ m/[^A-Za-z0-9_.%-]/);
+
   next unless($fName =~ /\.pm$/);
 
   # check for SVN Id