diff --git a/AppKit/stopwatch.h b/AppKit/stopwatch.h
index 122836d..4b43b7f 100644
--- a/AppKit/stopwatch.h
+++ b/AppKit/stopwatch.h
@@ -17,6 +17,7 @@ typedef struct {
 OS_STATIC_FORCE_INLINE
 void stopwatch_init(stopwatch_t* self) {
     self->start_tick = os_systick_safe_get();
+    self->end_tick = 0;
 }
 
 OS_STATIC_FORCE_INLINE