diff --git a/nsprpub/pr/src/md/unix/uxpoll.c b/nsprpub/pr/src/md/unix/uxpoll.c
index c504cd4d5f43..a95e45587cb7 100644
--- a/nsprpub/pr/src/md/unix/uxpoll.c
+++ b/nsprpub/pr/src/md/unix/uxpoll.c
@@ -173,6 +173,7 @@ static PRInt32 NativeThreadPoll(
         {
             /* make poll() ignore this entry */
             syspoll[index].fd = -1;
+            syspoll[index].events = 0;
             pds[index].out_flags = 0;
         }
     }
diff --git a/nsprpub/pr/src/pthreads/ptio.c b/nsprpub/pr/src/pthreads/ptio.c
index 8267148bbb10..3b9e74adbb66 100644
--- a/nsprpub/pr/src/pthreads/ptio.c
+++ b/nsprpub/pr/src/pthreads/ptio.c
@@ -3832,6 +3832,7 @@ static PRInt32 _pr_poll_with_poll(
             {
                 /* make poll() ignore this entry */
                 syspoll[index].fd = -1;
+                syspoll[index].events = 0;
                 pds[index].out_flags = 0;
             }
         }