diff --git a/libao2/ao_openal.c b/libao2/ao_openal.c
index 842a5a4049..f42ed63427 100644
--- a/libao2/ao_openal.c
+++ b/libao2/ao_openal.c
@@ -7,6 +7,8 @@
  * Copyleft 2006 by Reimar Döffinger (Reimar.Doeffinger@stud.uni-karlsruhe.de)
  */
 
+#include <stdlib.h>
+#include <stdio.h>
 #include <inttypes.h>
 #include <AL/alc.h>
 #include <AL/al.h>