diff --git a/src/utils.h b/src/utils.h
index 3a68f5ab..3be10c69 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -231,7 +231,7 @@ void *ss_malloc(size_t size);
 void *ss_align(size_t size);
 void *ss_realloc(void *ptr, size_t new_size);
 
-bool ss_is_ipv6addr(const char *addr);
+int ss_is_ipv6addr(const char *addr);
 
 #define ss_free(ptr)     \
     do {                 \