diff --git a/meta/recipes-extended/at/at/posixtm.c b/meta/recipes-extended/at/at/posixtm.c
index 5514ba4fe2..bba8312d9a 100644
--- a/meta/recipes-extended/at/at/posixtm.c
+++ b/meta/recipes-extended/at/at/posixtm.c
@@ -20,7 +20,7 @@
 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
    Rewritten by Jim Meyering.  */
 
-#include <config.h>
+#include "config.h"
 
 #include "posixtm.h"
 
@@ -42,8 +42,6 @@
    of `digit' even when the host does not conform to POSIX.  */
 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
 
-time_t mktime ();
-
 /*
   POSIX requires: