diff --git a/builder/family/beken-72xx.py b/builder/family/beken-72xx.py
index d2657a5..167b438 100644
--- a/builder/family/beken-72xx.py
+++ b/builder/family/beken-72xx.py
@@ -288,6 +288,7 @@ queue.AddLibrary(
     base_dir=ROOT_DIR,
     srcs=[
         "+<os/**/*.c>",
+        "-<os/platform_stub.c>",
     ],
     includes=[
         "+<os/*>",
diff --git a/builder/utils/flash.py b/builder/utils/flash.py
index 59ebd52..69b8141 100644
--- a/builder/utils/flash.py
+++ b/builder/utils/flash.py
@@ -64,7 +64,7 @@ def env_add_flash_layout(env: Environment, board: PlatformBoardConfig):
             length = int(length, 16)
             defines[f"FLASH_{name}_OFFSET"] = f"0x{offset:06X}"
             defines[f"FLASH_{name}_LENGTH"] = f"0x{length:06X}"
-            fal_items += f"FAL_PART_TABLE_ITEM({name.lower()},{name})"
+            fal_items += f"FAL_PART_TABLE_ITEM({name.lower()}, {name})"
             flash_size = max(flash_size, offset + length)
         defines["FLASH_LENGTH"] = f"0x{flash_size:06X}"
         # for "root" partition
diff --git a/platform.py b/platform.py
index df355ce..854493a 100644
--- a/platform.py
+++ b/platform.py
@@ -26,7 +26,7 @@ def check_ltchiptool(install: bool):
         # update ltchiptool to a supported version
         print("Installing/updating ltchiptool")
         system(
-            f"{sys.executable} -m pip install -U --force-reinstall "
+            f'"{sys.executable}" -m pip install -U --force-reinstall '
             f'"ltchiptool >= {LTCHIPTOOL_VERSION[1:]}a0, < 5.0"'
         )