diff --git a/boards/common/nucleo/include/board_nucleo.h b/boards/common/nucleo/include/board_nucleo.h
index b7ac1bf091..b7e524fe89 100644
--- a/boards/common/nucleo/include/board_nucleo.h
+++ b/boards/common/nucleo/include/board_nucleo.h
@@ -32,7 +32,7 @@ extern "C" {
  * @name    Xtimer configuration
  * @{
  */
-#if defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32L0) && \
+#if (defined(CPU_FAM_STM32F0) || defined(CPU_FAM_STM32L0)) && \
     !defined(CPU_MODEL_STM32F042K6) && !defined(CPU_MODEL_STM32F031K6)
 #define XTIMER_WIDTH                (16)
 #endif