diff --git a/boards/weact-f411ce/include/periph_conf.h b/boards/weact-f411ce/include/periph_conf.h
index 698e5e956c..45a4cb4f0e 100644
--- a/boards/weact-f411ce/include/periph_conf.h
+++ b/boards/weact-f411ce/include/periph_conf.h
@@ -162,15 +162,14 @@ static const spi_conf_t spi_config[] = {
  *
  * @{
  */
+static const adc_conf_t adc_config[] = {
+    {GPIO_PIN(PORT_A, 0), 0, 0},
+    {GPIO_PIN(PORT_A, 1), 0, 1},
+    {GPIO_PIN(PORT_A, 4), 0, 4},
+    {GPIO_PIN(PORT_B, 0), 0, 8},
+};
 
-#define ADC_CONFIG {             \
-    {GPIO_PIN(PORT_A, 0), 0, 0}, \
-    {GPIO_PIN(PORT_A, 1), 0, 1}, \
-    {GPIO_PIN(PORT_A, 4), 0, 4}, \
-    {GPIO_PIN(PORT_B, 0), 0, 8}, \
-}
-
-#define ADC_NUMOF           (4)
+#define ADC_NUMOF           ARRAY_SIZE(adc_config)
 /** @} */
 
 #ifdef __cplusplus