diff --git a/tests/listrigs.c b/tests/listrigs.c
index 65300d25f..230b1c413 100644
--- a/tests/listrigs.c
+++ b/tests/listrigs.c
@@ -27,7 +27,7 @@
 #include <hamlib/rig.h>
 
 
-int print_caps_sum(struct rig_caps *caps, void *data)
+int print_caps_sum(const struct rig_caps *caps, void *data)
 {
     const char *fmt1 = "%-13s";
     printf("%6u \t%-22s \t%-23s\t%-8s   \t",