diff --git a/main.c b/main.c
index 09f819f..6667c99 100644
--- a/main.c
+++ b/main.c
@@ -17,8 +17,8 @@ static const uint I2C_BAUDRATE = 100000; // 100 kHz
 #ifdef i2c_default
 // For this example, we run both the master and slave from the same board.
 // You'll need to wire pin GP4 to GP6 (SDA), and pin GP5 to GP7 (SCL).
-static const uint I2C_SLAVE_SDA_PIN = PICO_DEFAULT_I2C_SDA_PIN; // 4
-static const uint I2C_SLAVE_SCL_PIN = PICO_DEFAULT_I2C_SCL_PIN; // 5
+static const uint I2C_SLAVE_SDA_PIN = 19; // 4
+static const uint I2C_SLAVE_SCL_PIN = 18; // 5
 static const uint I2C_MASTER_SDA_PIN = 6;
 static const uint I2C_MASTER_SCL_PIN = 7;
 
@@ -70,9 +70,9 @@ static void setup_slave() {
     gpio_set_function(I2C_SLAVE_SCL_PIN, GPIO_FUNC_I2C);
     gpio_pull_up(I2C_SLAVE_SCL_PIN);
 
-    i2c_init(i2c0, I2C_BAUDRATE);
-    // configure I2C0 for slave mode
-    i2c_slave_init(i2c0, I2C_SLAVE_ADDRESS, &i2c_slave_handler);
+    i2c_init(i2c1, I2C_BAUDRATE);
+    // configure I2C1 for slave mode
+    i2c_slave_init(i2c1, I2C_SLAVE_ADDRESS, &i2c_slave_handler);
 }
 
 #endif