diff --git a/src/gl-auth-command b/src/gl-auth-command
index cc4b5f9..3f0ea3b 100755
--- a/src/gl-auth-command
+++ b/src/gl-auth-command
@@ -103,6 +103,7 @@ my ($verb, $repo) = ($cmd =~ /^\s*(git\s+\S+|\S+)\s+'\/?(.*?)(?:.git)?'/);
 die "bad command: $cmd.  Make sure the repo name is exactly as in your config\n"
     unless ( $verb and ( $verb =~ $R_COMMANDS or $verb =~ $W_COMMANDS )
         and  $repo and   $repo =~ $REPONAME_PATT );
+die "$repo ends with a slash; I don't like that\n" if $repo =~ /\/$/;
 
 # ----------------------------------------------------------------------------
 #       first level permissions check