Index: /trunk/tools/diff_outputs.pl
===================================================================
--- /trunk/tools/diff_outputs.pl	(revision 23932)
+++ /trunk/tools/diff_outputs.pl	(revision 23933)
@@ -52,5 +52,5 @@
 # Query to run
 my $sql = "SELECT path_base FROM diffSkyfile WHERE diff_id = $diff_id";
-$sql .= " AND skycell_id = $skycell_id" if defined $skycell_id;
+$sql .= " AND skycell_id = '$skycell_id'" if defined $skycell_id;
 
 # List of diffs