diff --git a/libmisc/idmapping.c b/libmisc/idmapping.c
index 34de3ce5..0dce634d 100644
--- a/libmisc/idmapping.c
+++ b/libmisc/idmapping.c
@@ -70,7 +70,7 @@ struct map_range *get_map_ranges(int ranges, int argc, char **argv)
 
 	/* Gather up the ranges from the command line */
 	mapping = mappings;
-	for (idx = 0; idx < ranges; idx++, argidx += 3, mapping++) {
+	for (idx = 0, argidx = 0; idx < ranges; idx++, argidx += 3, mapping++) {
 		if (!getulong(argv[argidx + 0], &mapping->upper)) {
 			free(mappings);
 			return NULL;