diff --git a/main.c b/main.c
index a0a92cd..e8decd3 100644
--- a/main.c
+++ b/main.c
@@ -114,13 +114,13 @@
 
 uint8_t gBuffer[SPM_PAGESIZE];
 
-void sendchar(uint8_t data)
+static void sendchar(uint8_t data)
 {
 	while (!(UART_STATUS & (1<<UART_TXREADY)));
 	UART_DATA = data;
 }
 
-uint8_t recvchar(void)
+static uint8_t recvchar(void)
 {
 	while (!(UART_STATUS & (1<<UART_RXREADY)));
 	return UART_DATA;
@@ -228,7 +228,7 @@ static inline uint16_t readEEpromPage(uint16_t address, pagebuf_t size)
 	return address;
 }
 
-uint8_t read_fuse_lock(uint16_t addr, uint8_t mode)
+static uint8_t read_fuse_lock(uint16_t addr, uint8_t mode)
 {
 	uint8_t retval;
 
@@ -247,7 +247,7 @@ uint8_t read_fuse_lock(uint16_t addr, uint8_t mode)
 	return retval;
 }
 
-void send_boot(void)
+static void send_boot(void)
 {
 	sendchar('A');
 	sendchar('V');
@@ -258,7 +258,7 @@ void send_boot(void)
 	sendchar('T');
 }
 
-void (*jump_to_app)(void) = 0x0000;
+static void (*jump_to_app)(void) = 0x0000;
 
 int main(void)
 {