diff --git a/test/nanostack/unittest/stub/fhss_callbacks_stub.c b/test/nanostack/unittest/stub/fhss_callbacks_stub.c
index 4feba327618..d531488b0c2 100644
--- a/test/nanostack/unittest/stub/fhss_callbacks_stub.c
+++ b/test/nanostack/unittest/stub/fhss_callbacks_stub.c
@@ -35,6 +35,11 @@ uint32_t mac_read_phy_datarate(const fhss_api_t *fhss_api)
     return 250000;
 }
 
+uint32_t mac_read_phy_timestamp(const fhss_api_t *fhss_api)
+{
+    return 0;
+}
+
 int mac_set_channel(const fhss_api_t *fhss_api, uint8_t channel_number)
 {
     fhss_callbacks_stub.uint8_value = channel_number;