diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index 96b15f64a..2ece86765 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -879,6 +879,7 @@ def build_bootloader(sdk_config):
             "-DPYTHON=" + get_python_exe(),
             "-DIDF_PATH=" + FRAMEWORK_DIR,
             "-DSDKCONFIG=" + SDKCONFIG_PATH,
+            "-DPROJECT_SOURCE_DIR=" + PROJECT_DIR,
             "-DLEGACY_INCLUDE_COMMON_HEADERS=",
             "-DEXTRA_COMPONENT_DIRS="
             + os.path.join(FRAMEWORK_DIR, "components", "bootloader"),