diff --git a/include/mdbfakeglib.h b/include/mdbfakeglib.h
index 2b5766d..1fbc683 100644
--- a/include/mdbfakeglib.h
+++ b/include/mdbfakeglib.h
@@ -1,5 +1,5 @@
-#ifndef _glib_shim_h_
-#define _glib_shim_h_
+#ifndef _mdbfakeglib_h_
+#define _mdbfakeglib_h_
 
 #include <time.h>
 #include <locale.h>
diff --git a/src/libmdb/fakeglib.c b/src/libmdb/fakeglib.c
index d980cf9..0d3e6d1 100644
--- a/src/libmdb/fakeglib.c
+++ b/src/libmdb/fakeglib.c
@@ -1,13 +1,14 @@
 
+#define _GNU_SOURCE
 #include "mdbfakeglib.h"
 
-#define _GNU_SOURCE /* vasprintf */
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include <getopt.h>
+#include <errno.h>
 
 /* string functions */