diff --git a/include/lc7981.h b/include/lc7981.h
index 4980927..02a5104 100644
--- a/include/lc7981.h
+++ b/include/lc7981.h
@@ -69,7 +69,7 @@
 #define PIXEL_OFF 0					//!< see lcd_plot_pixel
 
 void lcd_init(uint8_t mode);
-void lcd_clear();
+void lcd_clear(void);
 
 void lcd_write_text(char *txt);
 void lcd_gotoxy(uint8_t x, uint8_t y);
@@ -82,9 +82,9 @@ void lcd_plot_text(uint8_t x_off, uint8_t y_off, const char *text, uint8_t fw, u
 void lcd_plot_pgmtext(uint8_t x_off, uint8_t y_off, PGM_P text, uint8_t fw, uint8_t fh, PGM_P font);
 
 
-static inline void lcd_strobe();
+static inline void lcd_strobe(void);
 static inline void lcd_write_command(uint8_t cmd, uint8_t data);
-static inline uint8_t lcd_read_byte();
+static inline uint8_t lcd_read_byte(void);
 
 
 // Static inline functions, that can be used in the library and in the main programm
@@ -94,7 +94,7 @@ static inline uint8_t lcd_read_byte();
  * Generates the strobe signal for writing data.
  * This function is meant for internal usage only.
  */
-static inline void lcd_strobe() {
+static inline void lcd_strobe(void) {
 	lcd_en_high();
 	_delay_us(1);
 	lcd_en_low();
@@ -131,7 +131,7 @@ static inline void lcd_write_command(uint8_t cmd, uint8_t data) {
  * @return the byte which has been read
  * @see lcd_gotoxy
  */
-static inline uint8_t lcd_read_byte() {
+static inline uint8_t lcd_read_byte(void) {
 uint8_t i,data;
 
 	for(i = 0; i < 2; i++) {
diff --git a/include/touch.h b/include/touch.h
index 7ab88ee..fdbfd83 100644
--- a/include/touch.h
+++ b/include/touch.h
@@ -22,9 +22,9 @@
 
 #define TOUCH_PRESSED_LEVEL 1000
 
-uint8_t touch_is_pressed();
+uint8_t touch_is_pressed(void);
 
-int16_t touch_readX();
-int16_t touch_readY() ;
+int16_t touch_readX(void);
+int16_t touch_readY(void);
 
 #endif /* TOUCH_H_ */
diff --git a/makefile b/makefile
index 7818772..8de7fe6 100644
--- a/makefile
+++ b/makefile
@@ -430,7 +430,7 @@ end:
 
 # Display size of file.
 HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
-ELFSIZE = $(SIZE) --mcu=$(MCU) --format=avr $(TARGET).elf
+ELFSIZE = $(SIZE)  $(TARGET).elf
 
 sizebefore:
 	@if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); \
diff --git a/writing_demo.h b/writing_demo.h
index 42daba6..acfa1e6 100644
--- a/writing_demo.h
+++ b/writing_demo.h
@@ -13,6 +13,6 @@
 #include "include/adc.h"
 #include "include/touch.h"
 
-void writing_demo();
+void writing_demo(void);
 
 #endif /* PARTICEL_DEMO_H_ */