X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/276f020fb7d0ce2740e90a749b3a49d0d5f74d3d..f096bcccb8e4c9ba57d128c2f08c52f7dc94e07d:/src/exim_monitor/em_log.c

diff --git a/src/exim_monitor/em_log.c b/src/exim_monitor/em_log.c
index 348f0642f..1e1dc7c04 100644
--- a/src/exim_monitor/em_log.c
+++ b/src/exim_monitor/em_log.c
@@ -365,8 +365,9 @@ if (log_datestamping)
   {
   uschar log_file_wanted[256];
   /* Do *not* use "%s" here, we need the %D datestamp in the log_file string to
-  be expanded. */
-  string_format(log_file_wanted, sizeof(log_file_wanted), CS log_file);
+  be expanded.  The trailing NULL arg is to quieten preprocessors that need at
+  least one arg for a variadic set in a macro. */
+  string_format(log_file_wanted, sizeof(log_file_wanted), CS log_file, NULL);
   if (Ustrcmp(log_file_wanted, log_file_open) != 0)
     {
     if (LOG != NULL)