diff --git a/include/tlibc/std.h b/include/tlibc/std.h
index 27416e8..6d04233 100755
--- a/include/tlibc/std.h
+++ b/include/tlibc/std.h
@@ -9,6 +9,7 @@ extern "C" {
 #include <stdint.h>
 #include <stddef.h>
 #include <string.h>
+#include <stdarg.h>
 
 typedef int8_t i8;
 typedef uint8_t u8;