diff --git a/src/rp2_common/pico_btstack/CMakeLists.txt b/src/rp2_common/pico_btstack/CMakeLists.txt
index 010cc9e39..dcfcad4fe 100644
--- a/src/rp2_common/pico_btstack/CMakeLists.txt
+++ b/src/rp2_common/pico_btstack/CMakeLists.txt
@@ -308,6 +308,9 @@ if (EXISTS ${PICO_BTSTACK_PATH}/${BTSTACK_TEST_PATH})
             find_package (Python3 REQUIRED COMPONENTS Interpreter)
             get_filename_component(GATT_NAME "${GATT_FILE}" NAME_WE)
             get_filename_component(GATT_PATH "${GATT_FILE}" PATH)
+            if (NOT GATT_PATH)
+                set(GATT_PATH "${CMAKE_CURRENT_LIST_DIR}")
+            endif()
             set(TARGET_GATT "${TARGET_LIB}_gatt_header")
             set(GATT_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated/${TARGET_GATT}")
             set(GATT_HEADER "${GATT_BINARY_DIR}/${GATT_NAME}.h")