diff --git a/testsuite/log01/test_main.c b/testsuite/log01/test_main.c
index 86342a82..3a4ef65e 100644
--- a/testsuite/log01/test_main.c
+++ b/testsuite/log01/test_main.c
@@ -37,6 +37,7 @@
 
 #include <assert.h>
 #include <errno.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>