diff --git a/test/litest-mouse.c b/test/litest-mouse.c
index d1dd8e5a..8098ed26 100644
--- a/test/litest-mouse.c
+++ b/test/litest-mouse.c
@@ -35,6 +35,7 @@ static void litest_mouse_setup(void)
 }
 
 static struct litest_device_interface interface = {
+	NULL
 };
 
 static struct input_id input_id = {
diff --git a/test/litest-trackpoint.c b/test/litest-trackpoint.c
index 3a2cd39e..9ead59d4 100644
--- a/test/litest-trackpoint.c
+++ b/test/litest-trackpoint.c
@@ -35,6 +35,7 @@ static void litest_trackpoint_setup(void)
 }
 
 static struct litest_device_interface interface = {
+	NULL
 };
 
 static struct input_id input_id = {