diff --git a/test/gatt-service-client/CMakeLists.txt b/test/gatt-service-client/CMakeLists.txt
index 18a89496f..efa6181c6 100644
--- a/test/gatt-service-client/CMakeLists.txt
+++ b/test/gatt-service-client/CMakeLists.txt
@@ -26,6 +26,7 @@ set(SOURCES
 	../../src/btstack_linked_list.c
 	../../src/btstack_util.c
 	../../src/hci_dump.c
+	../../src/hci_event_builder.c
 	../../src/ble/gatt-service/ancs_client.c
 	../../src/ble/gatt-service/battery_service_client.c
 	../../src/ble/gatt-service/device_information_service_client.c
diff --git a/test/gatt-service-client/Makefile b/test/gatt-service-client/Makefile
index 5c5b7b631..abcff232c 100644
--- a/test/gatt-service-client/Makefile
+++ b/test/gatt-service-client/Makefile
@@ -24,6 +24,7 @@ COMMON = \
 	btstack_linked_list.c       \
 	btstack_util.c              \
 	hci_dump.c                  \
+	hci_event_builder.c         \
 	mock_gatt_client.c 			\
 
 CFLAGS_COVERAGE = ${CFLAGS} -fprofile-arcs -ftest-coverage