diff --git a/boards/stm32f4discovery/include/periph_conf.h b/boards/stm32f4discovery/include/periph_conf.h
index 4ef005f072..2e7402da76 100644
--- a/boards/stm32f4discovery/include/periph_conf.h
+++ b/boards/stm32f4discovery/include/periph_conf.h
@@ -232,7 +232,7 @@ static const i2c_conf_t i2c_config[] = {
         .dev            = I2C1,
         .speed          = I2C_SPEED_NORMAL,
         .scl_pin        = GPIO_PIN(PORT_B, 6),
-        .sda_pin        = GPIO_PIN(PORT_B, 7),
+        .sda_pin        = GPIO_PIN(PORT_B, 9),
         .scl_af         = GPIO_AF4,
         .sda_af         = GPIO_AF4,
         .bus            = APB1,