diff --git a/boards/nucleo-l152re/include/periph_conf.h b/boards/nucleo-l152re/include/periph_conf.h
index 306c5cc141..713540505c 100644
--- a/boards/nucleo-l152re/include/periph_conf.h
+++ b/boards/nucleo-l152re/include/periph_conf.h
@@ -236,16 +236,16 @@ static const i2c_conf_t i2c_config[] = {
  * @name   ADC configuration
  * @{
  */
-#define ADC_CONFIG {             \
-    { GPIO_PIN(PORT_A, 0), 0 },  \
-    { GPIO_PIN(PORT_A, 1), 1 },  \
-    { GPIO_PIN(PORT_A, 4), 4 },  \
-    { GPIO_PIN(PORT_B, 0), 8 },  \
-    { GPIO_PIN(PORT_C, 1), 11 }, \
-    { GPIO_PIN(PORT_C, 0), 10 }, \
-}
+static const adc_conf_t adc_config[] = {
+    { GPIO_PIN(PORT_A, 0), 0 },
+    { GPIO_PIN(PORT_A, 1), 1 },
+    { GPIO_PIN(PORT_A, 4), 4 },
+    { GPIO_PIN(PORT_B, 0), 8 },
+    { GPIO_PIN(PORT_C, 1), 11 },
+    { GPIO_PIN(PORT_C, 0), 10 },
+};
 
-#define ADC_NUMOF           (6U)
+#define ADC_NUMOF           ARRAY_SIZE(adc_config)
 /** @} */
 
 /**