diff --git a/src/run_loop_posix.c b/src/run_loop_posix.c
index 7cbb62a27..b2e91da0f 100644
--- a/src/run_loop_posix.c
+++ b/src/run_loop_posix.c
@@ -185,7 +185,7 @@ void posix_execute(void) {
 }
 
 // set timer
-void run_loop_set_timer(timer_source_t *a, int timeout_in_ms){
+void run_loop_set_timer(timer_source_t *a, uint32_t timeout_in_ms){
     gettimeofday(&a->timeout, NULL);
     a->timeout.tv_sec  +=  timeout_in_ms / 1000;
     a->timeout.tv_usec += (timeout_in_ms % 1000) * 1000;