diff --git a/boards/cc2538dk/include/board.h b/boards/cc2538dk/include/board.h
index 47416b74a..5743f9f00 100644
--- a/boards/cc2538dk/include/board.h
+++ b/boards/cc2538dk/include/board.h
@@ -77,10 +77,10 @@ extern "C" {
  * @{
  */
 #define XTIMER              TIMER_0
-#define XTIMER_CHAN         0
-#define XTIMER_SHIFT        -4
-#define XTIMER_BACKOFF      50
-#define XTIMER_ISR_BACKOFF  40
+#define XTIMER_CHAN         (0)
+#define XTIMER_SHIFT        (-4)
+#define XTIMER_BACKOFF      (50)
+#define XTIMER_ISR_BACKOFF  (40)
 /** @} */
 
 /**
diff --git a/boards/openmote-cc2538/include/board.h b/boards/openmote-cc2538/include/board.h
index 31e0a5ac2..d3363f26f 100644
--- a/boards/openmote-cc2538/include/board.h
+++ b/boards/openmote-cc2538/include/board.h
@@ -65,10 +65,10 @@
  * @{
  */
 #define XTIMER              TIMER_0
-#define XTIMER_CHAN         0
-#define XTIMER_SHIFT        -4
-#define XTIMER_BACKOFF      50
-#define XTIMER_ISR_BACKOFF  40
+#define XTIMER_CHAN         (0)
+#define XTIMER_SHIFT        (-4)
+#define XTIMER_BACKOFF      (50)
+#define XTIMER_ISR_BACKOFF  (40)
 /** @} */
 
 /**
diff --git a/boards/remote/include/board.h b/boards/remote/include/board.h
index 1c3531f4e..6ee6d39af 100644
--- a/boards/remote/include/board.h
+++ b/boards/remote/include/board.h
@@ -127,10 +127,10 @@
  * @{
  */
 #define XTIMER              TIMER_0
-#define XTIMER_CHAN         0
-#define XTIMER_SHIFT        -4
-#define XTIMER_BACKOFF      50
-#define XTIMER_ISR_BACKOFF  40
+#define XTIMER_CHAN         (0)
+#define XTIMER_SHIFT        (-4)
+#define XTIMER_BACKOFF      (50)
+#define XTIMER_ISR_BACKOFF  (40)
 /** @} */
 
 /**