diff --git a/boards/nucleo-l476rg/include/periph_conf.h b/boards/nucleo-l476rg/include/periph_conf.h
index c72582eb8d..e781c5593f 100644
--- a/boards/nucleo-l476rg/include/periph_conf.h
+++ b/boards/nucleo-l476rg/include/periph_conf.h
@@ -209,15 +209,16 @@ static const spi_conf_t spi_config[] = {
  *
  * @{
  */
-#define ADC_NUMOF           (6U)
-#define ADC_CONFIG {             \
-    {GPIO_PIN(PORT_A, 0), 0, 5},  /*< ADC12_IN5 */   \
-    {GPIO_PIN(PORT_A, 1), 0, 6},  /*< ADC12_IN6 */   \
-    {GPIO_PIN(PORT_A, 4), 1, 9},  /*< ADC12_IN9 */   \
-    {GPIO_PIN(PORT_B, 0), 1, 15}, /*< ADC12_IN15 */  \
-    {GPIO_PIN(PORT_C, 1), 2, 2},  /*< ADC123_IN_2 */ \
-    {GPIO_PIN(PORT_C, 0), 2, 1},  /*< ADC123_IN_1 */ \
-}
+static const adc_conf_t adc_config[] = {
+    {GPIO_PIN(PORT_A, 0), 0, 5},  /*< ADC12_IN5 */
+    {GPIO_PIN(PORT_A, 1), 0, 6},  /*< ADC12_IN6 */
+    {GPIO_PIN(PORT_A, 4), 1, 9},  /*< ADC12_IN9 */
+    {GPIO_PIN(PORT_B, 0), 1, 15}, /*< ADC12_IN15 */
+    {GPIO_PIN(PORT_C, 1), 2, 2},  /*< ADC123_IN_2 */
+    {GPIO_PIN(PORT_C, 0), 2, 1},  /*< ADC123_IN_1 */
+};
+
+#define ADC_NUMOF           ARRAY_SIZE(adc_config)
 /** @} */
 
 #ifdef __cplusplus