diff --git a/main.c b/main.c
index e9a8a2d..fc35103 100644
--- a/main.c
+++ b/main.c
@@ -345,7 +345,7 @@ we will only be able to provide 1 extension block since we can only respond to o
 		SCL_SNK_PU_PORT->CR1.reg |= SCL_SNK_PU_PIN; // switch pin to push pull
 		SCL_SNK_PU_PORT->DDR.reg |= SCL_SNK_PU_PIN; // switch pin to output
 		uint8_t i2c_rc = 1; // if the complete read succeeded
-		if (!softi2c_master_setup(1)) { // start the I²C master to talk to sink
+		if (!softi2c_master_setup(400)) { // start the I²C master to talk to sink
 			i2c_rc = 2;
 			goto i2c_end;
 		}