1 files changed, 2 insertions, 2 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index d7b256c8454..cbf928e786b 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -697,11 +697,11 @@ sys_subshell ()
       close_process_descs ();   /* Close Emacs's pipes/ptys */
 #endif
 
-#ifdef PRIO_PROCESS
+#ifdef SET_EMACS_PRIORITY
       {
         extern int emacs_priority;
 
-        if (emacs_priority)
+        if (emacs_priority < 0)
           nice (-emacs_priority);
       }
 #endif