diff --git a/module02/ex00/main.c b/module02/ex00/main.c
index dea9cbb..c29b238 100644
--- a/module02/ex00/main.c
+++ b/module02/ex00/main.c
@@ -94,9 +94,9 @@ void uart_init() {
 	UBRR0H = (unsigned char) (BAUD_PRESCALER >> 8);								// 20.11.5 : UBRRnL and UBRRnH – USART Baud Rate Registers
 	UBRR0L = (unsigned char) BAUD_PRESCALER;
 
-	UCSR0C = ASYNCHRONOUS | PARITY_DISABLED | STOP_ONE_BIT | DATA_EIGHT_BIT;	// 20.11.4 : set Frame Format
+	UCSR0C |= ASYNCHRONOUS | PARITY_DISABLED | STOP_ONE_BIT | DATA_EIGHT_BIT;	// 20.11.4 : set Frame Format
 	
-	UCSR0B = RECEIVER_DISABLED | TRANSMITTER_ENABLED;							// 20.11.3 : enable Receiver and/or Transmitter
+	UCSR0B |= RECEIVER_DISABLED | TRANSMITTER_ENABLED;							// 20.11.3 : enable Receiver and/or Transmitter
 }
 
 void uart_tx(char c) {