diff --git a/include/btstack/run_loop.h b/include/btstack/run_loop.h
index 31d9ad4d0..2c7b36d64 100644
--- a/include/btstack/run_loop.h
+++ b/include/btstack/run_loop.h
@@ -76,7 +76,7 @@ typedef struct timer {
 
 
 // set timer based on current time
-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);
 
 // add/remove timer_source
 void run_loop_add_timer(timer_source_t *timer); 
diff --git a/src/run_loop_embedded.c b/src/run_loop_embedded.c
index f5009a224..473403b58 100644
--- a/src/run_loop_embedded.c
+++ b/src/run_loop_embedded.c
@@ -146,8 +146,8 @@ static void embedded_tick_handler(void){
 }
 
 // set timer
-void run_loop_set_timer(timer_source_t *ts, int timeout_in_ms){
-    int ticks = timeout_in_ms / hal_tick_get_tick_period_in_ms();
+void run_loop_set_timer(timer_source_t *ts, uint32_t timeout_in_ms){
+    uint32_t ticks = timeout_in_ms / hal_tick_get_tick_period_in_ms();
     if (ticks == 0) ticks++;
     ts->timeout = system_ticks + ticks; 
 }