1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 623ab6b1dc7..09ca47a1f96 100644
--- a/src/process.c
+++ b/src/process.c
@@ -868,7 +868,7 @@ for the process which will run.")
      register Lisp_Object process, flag;
 {
   CHECK_PROCESS (process, 0);
-  XPROCESS (process)->inherit_coding_system_flag = !Fnull (flag);
+  XPROCESS (process)->inherit_coding_system_flag = !NILP (flag);
   return flag;
 }