diff --git a/testhal/STM32/STM32F4xx/SDC/main.c b/testhal/STM32/STM32F4xx/SDC/main.c
index 84c670a07..557dd427d 100644
--- a/testhal/STM32/STM32F4xx/SDC/main.c
+++ b/testhal/STM32/STM32F4xx/SDC/main.c
@@ -26,7 +26,8 @@
  * SDIO configuration.
  */
 static const SDCConfig sdccfg = {
-  SDC_MODE_4BIT
+  .bus_width = SDC_MODE_4BIT,
+  .slowdown  = 0U
 };
 
 /*