diff --git a/radio/src/targets/horus/extmodule_driver.cpp b/radio/src/targets/horus/extmodule_driver.cpp
index 0da9e46a5..e4b28244e 100644
--- a/radio/src/targets/horus/extmodule_driver.cpp
+++ b/radio/src/targets/horus/extmodule_driver.cpp
@@ -362,7 +362,7 @@ void extmoduleSendInvertedByte(uint8_t byte)
     // wait
   }
   time += 34;
-  for (i = 0 ; i < 8 ; i += 1) {
+  for (i = 0; i < 8; i++) {
     if (byte & 1) {
       GPIO_ResetBits(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PIN);
     }