diff --git a/test/test/device/msc/test_msc_device.c b/test/test/device/msc/test_msc_device.c
index 5003ac839..43a8e7438 100644
--- a/test/test/device/msc/test_msc_device.c
+++ b/test/test/device/msc/test_msc_device.c
@@ -184,8 +184,10 @@ uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
   return desc_configuration;
 }
 
-uint16_t const* tud_descriptor_string_cb(uint8_t index)
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
 {
+  (void) langid;
+
   return NULL;
 }
 
diff --git a/test/test/device/usbd/test_usbd.c b/test/test/device/usbd/test_usbd.c
index 245353106..af30aaf8f 100644
--- a/test/test/device/usbd/test_usbd.c
+++ b/test/test/device/usbd/test_usbd.c
@@ -111,8 +111,10 @@ uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
   return desc_configuration;
 }
 
-uint16_t const* tud_descriptor_string_cb(uint8_t index)
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
 {
+  (void) langid;
+
   return NULL;
 }