diff --git a/dlls/kernel32/cpu.c b/dlls/kernel32/cpu.c
index 40d38254a9f..d08e429438e 100644
--- a/dlls/kernel32/cpu.c
+++ b/dlls/kernel32/cpu.c
@@ -22,6 +22,7 @@
 #include "config.h"
 #include "wine/port.h"
 
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #ifdef HAVE_SYS_TIME_H