diff --git a/gbdk_example/src/gbdk_player_example.c b/gbdk_example/src/gbdk_player_example.c
index 9133949..0b2c4fb 100644
--- a/gbdk_example/src/gbdk_player_example.c
+++ b/gbdk_example/src/gbdk_player_example.c
@@ -10,7 +10,7 @@ const unsigned char pattern1[] = {0x80,0x80,0x40,0x40,0x20,0x20,0x10,0x10,0x08,0
 const unsigned char pattern2[] = {0x00,0x00,0x7E,0x7E,0x40,0x40,0x54,0x54,0x48,0x48,0x54,0x54,0x40,0x40,0x00,0x00};
 const unsigned char map[]      = {0x00,0x20};
 
-void main() {
+void main(void) {
     LCDC_REG = 0xD1;
     BGP_REG  = 0b11100100;
     NR52_REG = 0x80;