diff --git a/firmware/Makefile b/firmware/Makefile
index 1020d16..6ee8916 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -7,7 +7,7 @@ OBJCOPY = avr-objcopy
 AVRDUDE ?= avrdude
 
 # Compiler and linker flags
-CFLAGS = -Wall -std=c11 -Os
+CFLAGS = -Wall -pedantic -std=c11 -Os
 LDFLAGS =
 
 # Target platform and programmer
diff --git a/firmware/src/BitIO.h b/firmware/src/BitIO.h
index 13f6605..4c5630c 100644
--- a/firmware/src/BitIO.h
+++ b/firmware/src/BitIO.h
@@ -16,19 +16,19 @@
 static inline void BIT_SET(volatile uint8_t *target, uint8_t bit) __attribute__((always_inline));
 static inline void BIT_SET(volatile uint8_t *target, uint8_t bit){
     *target |= (1<<bit);
-};
+}
 
 // set clear
 static inline void BIT_CLEAR(volatile uint8_t *target, uint8_t bit) __attribute__((always_inline));
 static inline void BIT_CLEAR(volatile uint8_t *target, uint8_t bit){
     *target &= ~(1<<bit);
-};
+}
 
 // bit toogle
 static inline void BIT_TOGGLE(volatile uint8_t *target, uint8_t bit) __attribute__((always_inline));
 static inline void BIT_TOGGLE(volatile uint8_t *target, uint8_t bit){
     *target ^= (1<<bit);
-};
+}
 
 // set bit by boolean
 static inline void BIT_BOOL_SET(volatile uint8_t *target, uint8_t bit, bool enable) __attribute__((always_inline));
@@ -38,6 +38,6 @@ static inline void BIT_BOOL_SET(volatile uint8_t *target, uint8_t bit, bool enab
     }else{
         BIT_CLEAR(target, bit);
     }
-};
+}
 
 #endif /* BITIO_H_ */