1 files changed, 2 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 06edf7c5e84..4ad8fe24af5 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2312,7 +2312,8 @@ wait_reading_process_input (time_limit, microsecs, read_kbd, do_display)
 
           /* Read data from the process, until we exhaust it.  */
           while (XINT (wait_proc->infd) >= 0
-                 && nread = read_process_output (proc, XINT (wait_proc->infd)))
+                 && (nread
+                     = read_process_output (proc, XINT (wait_proc->infd))))
             total_nread += nread;
           if (total_nread > 0 && do_display)
             redisplay_preserve_echo_area ();