diff --git a/boards/common/stm32f103c8/include/periph_conf.h b/boards/common/stm32f103c8/include/periph_conf.h
index bbd0119b41..2f56a63677 100644
--- a/boards/common/stm32f103c8/include/periph_conf.h
+++ b/boards/common/stm32f103c8/include/periph_conf.h
@@ -162,8 +162,8 @@ static const i2c_conf_t i2c_config[] = {
     {
         .dev            = I2C1,
         .speed          = I2C_SPEED_NORMAL,
-        .scl_pin        = GPIO_PIN(PORT_B, 8),
-        .sda_pin        = GPIO_PIN(PORT_B, 9),
+        .scl_pin        = GPIO_PIN(PORT_B, 6),
+        .sda_pin        = GPIO_PIN(PORT_B, 7),
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C1EN,
         .clk            = CLOCK_APB1,