diff --git a/swaylock/main.c b/swaylock/main.c
index 3d57eb75b..ebd87d32e 100644
--- a/swaylock/main.c
+++ b/swaylock/main.c
@@ -716,7 +716,7 @@ static char *get_config_path(void) {
 
 	wordexp_t p;
 	char *path;
-	for (int i = 0; i < (int)(sizeof(config_paths) / sizeof(char *)); ++i) {
+	for (size_t i = 0; i < (int)(sizeof(config_paths) / sizeof(char *)); ++i) {
 		if (wordexp(config_paths[i], &p, 0) == 0) {
 			path = strdup(p.we_wordv[0]);
 			wordfree(&p);