diff --git a/cpu/stm32_common/periph/i2c_2.c b/cpu/stm32_common/periph/i2c_2.c
index 5f1316f4e6..d073b4b118 100644
--- a/cpu/stm32_common/periph/i2c_2.c
+++ b/cpu/stm32_common/periph/i2c_2.c
@@ -79,9 +79,7 @@ void i2c_init(i2c_t dev)
 
     mutex_init(&locks[dev]);
 
-    I2C_TypeDef *i2c = i2c_config[dev].dev;
-
-    assert(i2c != NULL);
+    assert(i2c_config[dev].dev != NULL);
 
     periph_clk_en(i2c_config[dev].bus, i2c_config[dev].rcc_mask);
     NVIC_SetPriority(i2c_config[dev].irqn, I2C_IRQ_PRIO);
@@ -91,9 +89,9 @@ void i2c_init(i2c_t dev)
 
 #if defined(CPU_FAM_STM32F4)
     /* make sure the analog filters don't hang -> see errata sheet 2.14.7 */
-    if (i2c->SR2 & I2C_SR2_BUSY) {
+    if (i2c_config[dev].dev->SR2 & I2C_SR2_BUSY) {
         /* disable peripheral */
-        i2c->CR1 &= ~I2C_CR1_PE;
+        i2c_config[dev].dev->CR1 &= ~I2C_CR1_PE;
         /* toggle both pins to reset analog filter */
         gpio_init(i2c_config[dev].scl_pin, GPIO_OD);
         gpio_init(i2c_config[dev].sda_pin, GPIO_OD);