diff --git a/Firmware/merge_firmware.py b/Firmware/merge_firmware.py
index a2f9ee0..5b20ce6 100644
--- a/Firmware/merge_firmware.py
+++ b/Firmware/merge_firmware.py
@@ -36,10 +36,10 @@ def esp32_create_combined_bin(source, target, env):
     cmd = [
         "--chip",
         chip,
-        "merge_bin",
+        "merge-bin",
         "-o",
         new_file_name,
-        "--flash_size",
+        "--flash-size",
         flash_size,
     ]