diff --git a/lib/isc/tests/buffer_test.c b/lib/isc/tests/buffer_test.c
index 89009e0a9d..a09e6f96d7 100644
--- a/lib/isc/tests/buffer_test.c
+++ b/lib/isc/tests/buffer_test.c
@@ -21,6 +21,7 @@
 #include "isctest.h"
 
 #include <isc/buffer.h>
+#include <isc/print.h>
 #include <isc/region.h>
 #include <isc/result.h>
 #include <isc/types.h>