diff --git a/lib/hdb/hdb.h b/lib/hdb/hdb.h
index a4dd12c0e..f92405dff 100644
--- a/lib/hdb/hdb.h
+++ b/lib/hdb/hdb.h
@@ -36,6 +36,8 @@
 #ifndef __HDB_H__
 #define __HDB_H__
 
+#include <stdio.h>
+
 #include <krb5.h>
 
 #include <hdb_err.h>