diff --git a/include/output.h b/include/output.h
index 4a970dc4..5e16420b 100644
--- a/include/output.h
+++ b/include/output.h
@@ -28,6 +28,8 @@
 #ifndef __ALSA_OUTPUT_H
 #define __ALSA_OUTPUT_H
 
+#include <stdarg.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif