diff --git a/src/com232.c b/src/com232.c
index 9765f53..ab30c32 100644
--- a/src/com232.c
+++ b/src/com232.c
@@ -38,7 +38,6 @@
   (uint16_t)((float)(F_CPU * 64 / (RXMODE_S * (float)BAUD_RATE)) + 0.5)
 
 uint8_t RS232_RxCharBuffer[25], RS232_RxCharBegin, RS232_RxCharEnd;
-uint8_t readkey;
 
 void RS232_Init(void) {
   RS232_RxCharBegin = RS232_RxCharEnd = 0;
diff --git a/src/com232.h b/src/com232.h
index 63cb40d..6e390f9 100644
--- a/src/com232.h
+++ b/src/com232.h
@@ -26,7 +26,6 @@
 #include <stdint.h>
 
 extern uint8_t RS232_RxCharBuffer[25], RS232_RxCharBegin, RS232_RxCharEnd;
-extern uint8_t readkey;
 
 void RS232_Init(void);
 void RS232_Print_P(const char *str_addr);
diff --git a/src/sniffer.c b/src/sniffer.c
index 4c8c211..b847f74 100644
--- a/src/sniffer.c
+++ b/src/sniffer.c
@@ -36,6 +36,7 @@
 uint8_t Event;
 uint8_t echoCharacters;
 uint8_t readBinary;
+uint8_t readkey;
 
 const char const *offon[] = {"OFF", "ON"};