diff --git a/wsutil/ws_pipe.c b/wsutil/ws_pipe.c
index d09f6bfe19..bd712bcb85 100644
--- a/wsutil/ws_pipe.c
+++ b/wsutil/ws_pipe.c
@@ -484,7 +484,7 @@ ws_read_string_from_pipe(ws_pipe_handle read_pipe, gchar *buffer,
         {
             break;
         }
-        if (bytes_avail <= 0)
+        if (bytes_avail == 0)
         {
             ret = TRUE;
             break;