diff --git a/lib/tests/mes/90-abtod.c b/lib/tests/mes/90-abtod.c
index 9f081fde..98d7d58a 100644
--- a/lib/tests/mes/90-abtod.c
+++ b/lib/tests/mes/90-abtod.c
@@ -20,6 +20,7 @@
 
 #include <mes/lib.h>
 #include <stdlib.h>
+#include <stdio.h>
 
 int
 main ()