diff --git a/litex/soc/software/bios/boot.c b/litex/soc/software/bios/boot.c
index 5ade1c89c..34079b69d 100755
--- a/litex/soc/software/bios/boot.c
+++ b/litex/soc/software/bios/boot.c
@@ -99,7 +99,7 @@ void romboot(void)
 #ifdef CSR_UART_BASE
 
 #define ACK_TIMEOUT_DELAY CONFIG_CLOCK_FREQUENCY/4
-#define CMD_TIMEOUT_DELAY CONFIG_CLOCK_FREQUENCY/16
+#define CMD_TIMEOUT_DELAY CONFIG_CLOCK_FREQUENCY/4
 
 static void timer0_load(unsigned int value) {
 	timer0_en_write(0);