diff --git a/bin/tests/wire_test.c b/bin/tests/wire_test.c
index 1c3ab60e01..f46501f020 100644
--- a/bin/tests/wire_test.c
+++ b/bin/tests/wire_test.c
@@ -19,6 +19,7 @@
 
 #include <stdlib.h>
 
+#include <isc/buffer.h>
 #include <isc/mem.h>
 #include <isc/string.h>
 #include <isc/util.h>