diff --git a/bin/tests/shutdown_test.c b/bin/tests/shutdown_test.c
index ef58f1a461..d4f8c6cfe5 100644
--- a/bin/tests/shutdown_test.c
+++ b/bin/tests/shutdown_test.c
@@ -16,6 +16,7 @@
 #include <isc/app.h>
 #include <isc/mem.h>
 #include <isc/print.h>
+#include <isc/string.h>
 #include <isc/task.h>
 #include <isc/time.h>
 #include <isc/timer.h>