diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index 11de9bbf6..ea73bc73a 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -120,7 +120,7 @@ def _get_installed_standard_pip_packages():
 board = env.BoardConfig()
 mcu = board.get("build.mcu", "esp32")
 flash_speed = board.get("build.f_flash", "40000000L")
-flash_frequency = str(int(str(flash_speed).replace("L", "")) / 1000000) + "m"
+flash_frequency = str(flash_speed.replace("000000L", "m"))
 flash_mode = board.get("build.flash_mode", "dio")
 idf_variant = mcu.lower()
 flag_custom_sdkonfig = False