diff --git a/Compiling-and-flashing-the-firmware.md b/Compiling-and-flashing-the-firmware.md
index df91128..6ef59fb 100644
--- a/Compiling-and-flashing-the-firmware.md
+++ b/Compiling-and-flashing-the-firmware.md
@@ -85,7 +85,7 @@ If you have set default_envs in [platformio.ini](/platformio.ini) you can ommit
 ### Troubleshooting
 If you cannot flash the firmware:
 - Make sure you properly unlocked the chip
-- Make sure you are don't have an already open connection to the chip in another software (st-link utility, ...)
+- Make sure you don't have an already open connection to the chip in another software (st-link utility, ...)
 - Make sure you properly soldered the headers/wires, clean contact is mandatory
 - Also keep in mind the debugging header pinout can differ on some boards