diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b1aec5b2..01858f2f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
         sudo tcpdump -nn -i any port 123 or port 53 -w sntp.cap &
         sleep 1
     - name: test
-      run: make clean test IPV6=0 SSL= OPTS= V=4
+      run: make clean test IPV6=0 SSL= OPTS= V=4 TFLAGS=-DMG_ENABLE_POLL=1
     - name: Upload capture
       if: always()
       run: |
diff --git a/mongoose.c b/mongoose.c
index c8b2c40e..8da22778 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -4413,6 +4413,7 @@ static void mg_iotest(struct mg_mgr *mgr, int ms) {
     }
   }
 
+  MG_DEBUG(("n=%d ms=%d", n, ms));
   if (poll(fds, n, ms) < 0) {
     MG_ERROR(("poll failed, errno: %d", MG_SOCK_ERRNO));
   } else {