diff --git a/src/core/ev.c b/src/core/ev.c
index f1989722..4b5e27f4 100644
--- a/src/core/ev.c
+++ b/src/core/ev.c
@@ -1535,7 +1535,11 @@ void janet_loop1_impl(int has_timeout, JanetTimestamp to) {
     }
     BOOL result = GetQueuedCompletionStatus(janet_vm.iocp, &num_bytes_transfered, &completionKey, &overlapped, (DWORD) waittime);
 
-    if (result || overlapped) {
+    if (!result) {
+        return;
+    }
+
+    if (overlapped) {
         if (0 == completionKey) {
             /* Custom event */
             JanetSelfPipeEvent *response = (JanetSelfPipeEvent *)(overlapped);