diff --git a/src/convert.c b/src/convert.c
index 8722cc8d5..6470c9e32 100644
--- a/src/convert.c
+++ b/src/convert.c
@@ -23,10 +23,9 @@ int main(int argc, char **argv) {
     if (argc < 2) return usage();
     mode = argv[1];
     if (strcmp(mode, "rules")==0) {
-        const char *xmlfile, *catalog;
+        const char *xmlfile;
         if (argc < 4) return usage();
         xmlfile = argv[2];
-        catalog = argv[3];
         read_xml(xmlfile);
         write_rules("rules.dat");
         return 0;