diff --git a/include/dicom/dicom.h b/include/dicom/dicom.h
index 4ba7c65..8dedf0d 100644
--- a/include/dicom/dicom.h
+++ b/include/dicom/dicom.h
@@ -1,6 +1,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdarg.h>
 
 #include "version.h"