diff --git a/tests/cpu_efm32_features/Makefile b/tests/cpu_efm32_features/Makefile
index 25f2c1a11e..224d17e7fd 100644
--- a/tests/cpu_efm32_features/Makefile
+++ b/tests/cpu_efm32_features/Makefile
@@ -11,5 +11,6 @@ BOARD_WHITELIST := ikea-tradfri \
 
 # see cpu/efm32/efm32-features.mk for the supported flags
 EFM32_UART_MODES = 1
+EFM32_LEUART_ENABLED = 0
 
 include $(RIOTBASE)/Makefile.include
diff --git a/tests/cpu_efm32_features/README.md b/tests/cpu_efm32_features/README.md
index e933ab115f..99b79eb802 100644
--- a/tests/cpu_efm32_features/README.md
+++ b/tests/cpu_efm32_features/README.md
@@ -3,7 +3,8 @@
 ## Introduction
 The EFM32 support several features that can be toggled compile-time.
 
-This test will ensure that RIOT-OS will compile whenever these features are toggled.
+This test will ensure that RIOT-OS will compile whenever these features are
+toggled.
 
 ## Expected result
 The test application compiles for EFM32-based boards.
diff --git a/tests/cpu_efm32_features/main.c b/tests/cpu_efm32_features/main.c
index 7c6c33e482..2851b1c4bc 100644
--- a/tests/cpu_efm32_features/main.c
+++ b/tests/cpu_efm32_features/main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 Bas Stottelaar <basstottelaar@gmail.com>
+ * Copyright (C) 2018-2019 Bas Stottelaar <basstottelaar@gmail.com>
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -20,6 +20,10 @@
 
 #include "periph/uart.h"
 
+#if EFM32_LEUART_ENABLED
+#error "Expected EFM32_LEUART_ENABLED feature to be disabled."
+#endif
+
 int main(void)
 {
     /* test if uart_config[i].mode is set to a know value */