diff --git a/tests/cpu_efm32_features/main.c b/tests/cpu_efm32_features/main.c
index efed804022..37c9c3d4c6 100644
--- a/tests/cpu_efm32_features/main.c
+++ b/tests/cpu_efm32_features/main.c
@@ -18,6 +18,8 @@
  * @}
  */
 
+#include <stdio.h>
+
 #include "periph/uart.h"
 
 #if EFM32_LEUART_ENABLED