--- a/Source/log.c
+++ b/Source/log.c
@@ -147,7 +147,7 @@
   }
 
   if (repeats > 0) {
-    snprintf(date, 27, asctime(localtime(&last_repeat)));
+    snprintf(date, 27, "%s", asctime(localtime(&last_repeat)));
     snprintf(repeat_message, 40, "last message repeated %d time(s)\n", repeats);
     write(fd, date+4, strlen(date)-10);
     write(fd, " ", 1);
@@ -155,7 +155,7 @@
     repeats = 0;
   }
 
-  snprintf(date, 27, asctime(localtime(&current)));
+  snprintf(date, 27, "%s", asctime(localtime(&current)));
   write(fd, date+4, strlen(date)-10);
   write(fd, " ", 1);
   write(fd, entry, (strlen(entry) < 1023) ? strlen(entry) : 1023 );