diff --git a/usr.sbin/dntpd/log.c b/usr.sbin/dntpd/log.c
index 5e0291b..09e9798 100644
--- a/usr.sbin/dntpd/log.c
+++ b/usr.sbin/dntpd/log.c
@@ -113,21 +113,30 @@ vlogline(int level, int newline, const char *ctl, va_list va)
 {
     static char line_build[1024];
     static int line_index;
-    int priority;
+    int priority, used = 0;
+    va_list va2;
 
     /*
      * Output to stderr directly but build the log line for syslog.
      */
     if (level <= debug_level) {
 	if (log_stderr) {
+	    used = 1;
+	    va_copy(va2, va);
 	    vfprintf(stderr, ctl, va);
 	    if (newline)
 		fprintf(stderr, "\n");
 	    fflush(stderr);
 	}
 	if (debug_opt == 0) {
-	    vsnprintf(line_build + line_index, sizeof(line_build) - line_index, 
-		    ctl, va);
+	    if (used == 0)
+		vsnprintf(line_build + line_index,
+			sizeof(line_build) - line_index,
+			ctl, va);
+	    else
+		vsnprintf(line_build + line_index,
+			sizeof(line_build) - line_index,
+			ctl, va2);
 	    line_index += strlen(line_build + line_index);
 	    if (line_index && line_build[line_index-1] == '\n') {
 		newline = 1;