diff --git a/libntfs-3g/acls.c b/libntfs-3g/acls.c
index d7966e0f..5d03b9a7 100644
--- a/libntfs-3g/acls.c
+++ b/libntfs-3g/acls.c
@@ -72,6 +72,7 @@
 #include <time.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <sys/types.h>
 #include <errno.h>