diff --git a/tests/xtimer_mutex_lock_timeout/main.c b/tests/xtimer_mutex_lock_timeout/main.c
index f06cf8e25c..b6df26678e 100644
--- a/tests/xtimer_mutex_lock_timeout/main.c
+++ b/tests/xtimer_mutex_lock_timeout/main.c
@@ -25,6 +25,13 @@
 #include "msg.h"
 #include "irq.h"
 
+/* XTIMER_SHIFT can be undefined when using xtimer_on_ztimer on boards
+ * incompatible with xtimers tick conversion, e.g. the waspmote-pro
+ */
+#ifndef XTIMER_SHIFT
+#define XTIMER_SHIFT    (0)
+#endif
+
 /* timeout at one millisecond (1000 us) to make sure it does not spin. */
 #define LONG_MUTEX_TIMEOUT 1000
 
diff --git a/tests/xtimer_rmutex_lock_timeout/main.c b/tests/xtimer_rmutex_lock_timeout/main.c
index 0bf324073f..8cac5b0fda 100644
--- a/tests/xtimer_rmutex_lock_timeout/main.c
+++ b/tests/xtimer_rmutex_lock_timeout/main.c
@@ -26,6 +26,13 @@
 #include "msg.h"
 #include "irq.h"
 
+/* XTIMER_SHIFT can be undefined when using xtimer_on_ztimer on boards
+ * incompatible with xtimers tick conversion, e.g. the waspmote-pro
+ */
+#ifndef XTIMER_SHIFT
+#define XTIMER_SHIFT    (0)
+#endif
+
 /* timeout at one millisecond (1000 us) to make sure it does not spin. */
 #define LONG_RMUTEX_TIMEOUT 1000