diff --git a/radio/src/io/frsky_firmware_update.cpp b/radio/src/io/frsky_firmware_update.cpp
index f1460e6cc..1e793c4b3 100644
--- a/radio/src/io/frsky_firmware_update.cpp
+++ b/radio/src/io/frsky_firmware_update.cpp
@@ -120,14 +120,13 @@ void FrskyDeviceFirmwareUpdate::startup()
 
 bool FrskyDeviceFirmwareUpdate::readBuffer(uint8_t * buffer, uint8_t count, uint32_t timeout)
 {
-  uint32_t elapsed = 0;
-
   watchdogSuspend(timeout);
 
   switch(module) {
 #if defined(INTMODULE_USART)
     case INTERNAL_MODULE:
     {
+      uint32_t elapsed = 0;
       uint8_t index = 0;
       while (index < count && elapsed < timeout) {
         if (intmoduleFifo.pop(buffer[index])) {