diff --git a/include/io_utils.h b/include/io_utils.h
index 0dc6d3f..3339e28 100644
--- a/include/io_utils.h
+++ b/include/io_utils.h
@@ -21,6 +21,7 @@
 #include "common_types.h"
 #include "code_attributes.h"
 #include <stdio.h>
+#include <stdarg.h>
 
 #if defined (__cplusplus)
 extern "C"
diff --git a/include/secure_file.h b/include/secure_file.h
index 549d784..91ae0bc 100644
--- a/include/secure_file.h
+++ b/include/secure_file.h
@@ -19,6 +19,7 @@
 #include "common_types.h"
 #include "code_attributes.h"
 #include <stdio.h>
+#include <stdarg.h>
 
 #if defined (__cplusplus)
 extern "C"