diff --git a/supervisor/http.py b/supervisor/http.py
index f65daf142..e5559209a 100644
--- a/supervisor/http.py
+++ b/supervisor/http.py
@@ -336,9 +336,9 @@ def writable(self, t=time.time):
         if self.delay:
             # we called a deferred producer via this channel (see refill_buffer)
             last_writable_check = self.writable_check
-            self.writable_check = now
             elapsed = now - last_writable_check
             if elapsed > self.delay:
+                self.writable_check = now
                 return True
             else:
                 return False