diff --git a/xrdp/xrdp_mm.c b/xrdp/xrdp_mm.c
index bd8edaea..3f688662 100644
--- a/xrdp/xrdp_mm.c
+++ b/xrdp/xrdp_mm.c
@@ -18,7 +18,9 @@
  * module manager
  */
 
+#if defined(HAVE_CONFIG_H)
 #include <config_ac.h>
+#endif
 #define ACCESS
 #include "xrdp.h"
 #include "log.h"