diff --git a/sway/main.c b/sway/main.c
index 757f9a042..c9e7c1852 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -229,6 +229,9 @@ int main(int argc, char **argv) {
 			exit(EXIT_SUCCESS);
 			break;
 		case 'c': // config
+			if (config_path != NULL) {
+				free(config_path);
+			}
 			config_path = strdup(optarg);
 			break;
 		case 'C': // validate