diff --git a/t-dll-api.cc b/t-dll-api.cc
index 10b51e8ee..1fe27f94c 100644
--- a/t-dll-api.cc
+++ b/t-dll-api.cc
@@ -22,6 +22,7 @@
 # include  "t-dll.h"
 # include  "discipline.h"
 # include  <stdlib.h>
+# include  <stdio.h>
 # include  <string.h>
 #ifdef HAVE_MALLOC_H
 # include  <malloc.h>