diff --git a/bin/tests/system/dlzexternal/driver.c b/bin/tests/system/dlzexternal/driver.c
index 88660196fc..5818890307 100644
--- a/bin/tests/system/dlzexternal/driver.c
+++ b/bin/tests/system/dlzexternal/driver.c
@@ -29,6 +29,7 @@
 #include <stdarg.h>
 
 #include <isc/log.h>
+#include <isc/print.h>
 #include <isc/result.h>
 #include <isc/types.h>
 #include <isc/util.h>