diff --git a/scripts/fbt_tools/fbt_extapps.py b/scripts/fbt_tools/fbt_extapps.py
index 9482272f3..79788ff0c 100644
--- a/scripts/fbt_tools/fbt_extapps.py
+++ b/scripts/fbt_tools/fbt_extapps.py
@@ -52,6 +52,9 @@ class AppBuilder:
         self.app_env = self.fw_env.Clone(
             FAP_SRC_DIR=self.app._appdir, FAP_WORK_DIR=self.app_work_dir
         )
+        self.app_env.Append(
+            CPPDEFINES=self.app.cdefines,
+        )
         self.app_env.VariantDir(self.app_work_dir, self.app._appdir, duplicate=False)
 
     def _build_external_files(self):