1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 83188534796..443da073337 100644
--- a/src/process.c
+++ b/src/process.c
@@ -1917,7 +1917,7 @@ Return non-nil iff we received any output before the timeout expired.")
     {
       CHECK_NUMBER (timeout, 1);
       seconds = XINT (timeout);
-      if (seconds <= 0)
+      if (seconds < 0 || (seconds == 0 && useconds == 0))
         seconds = -1;
     }
   else