diff --git a/include/atari7800.h b/include/atari7800.h
index 3cbeedb8b..b289bb41e 100644
--- a/include/atari7800.h
+++ b/include/atari7800.h
@@ -52,7 +52,7 @@
 /* No support for dynamically loadable drivers */
 #define DYN_DRV 0
 
-extern unsigned char get_tv(void);           /* get TV system */
+unsigned char get_tv(void);           /* get TV system */
 
 #include <_tia.h>
 #define TIA (*(struct __tia*)0x0000)