diff --git a/sys/include/xtimer.h b/sys/include/xtimer.h
index 961b9043a3..976870e5fc 100644
--- a/sys/include/xtimer.h
+++ b/sys/include/xtimer.h
@@ -482,9 +482,9 @@ static inline void xtimer_spin(uint32_t offset) {
     while ((_xtimer_now() - start) < offset);
 }
 
-static inline void xtimer_usleep(uint32_t offset)
+static inline void xtimer_usleep(uint32_t microseconds)
 {
-    _xtimer_sleep(offset, 0);
+    _xtimer_sleep(microseconds, 0);
 }
 
 static inline void xtimer_usleep64(uint64_t microseconds)
@@ -494,7 +494,7 @@ static inline void xtimer_usleep64(uint64_t microseconds)
 
 static inline void xtimer_sleep(uint32_t seconds)
 {
-    xtimer_usleep64((uint64_t)seconds*SEC_IN_USEC);
+    xtimer_usleep64((uint64_t)seconds * SEC_IN_USEC);
 }
 
 static inline void xtimer_nanosleep(uint32_t nanoseconds)