diff --git a/lib/multi.c b/lib/multi.c
index 2eed1b2b3c..78cd2af680 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1088,8 +1088,8 @@ static void singlesocket(struct Curl_multi *multi,
             continue;
         }
 
-        action = (current.action & GETSOCK_READSOCK(i)?CURL_POLL_IN:0) |
-          (current.action & GETSOCK_WRITESOCK(i)?CURL_POLL_OUT:0);
+        action = ((current.action & GETSOCK_READSOCK(i))?CURL_POLL_IN:0) |
+          ((current.action & GETSOCK_WRITESOCK(i))?CURL_POLL_OUT:0);
       }
 
       /* call the callback with this new info */