diff --git a/lib/stub/asctime.c b/lib/stub/asctime.c
index 65eb9783..63c51659 100644
--- a/lib/stub/asctime.c
+++ b/lib/stub/asctime.c
@@ -19,6 +19,7 @@
  */
 
 #include <mes/lib.h>
+#include <errno.h>
 #include <time.h>
 
 char *