diff --git a/hal/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/us_ticker.c b/hal/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/us_ticker.c
index 11aebbe148..abbe793a52 100644
--- a/hal/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/us_ticker.c
+++ b/hal/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/us_ticker.c
@@ -462,9 +462,9 @@ static inline bool is_in_wrapped_range(uint32_t begin, uint32_t end, uint32_t va
     // return true if  begin <= val < end
     if (begin < end) {
         if (begin <= val && val < end) {
-            return false;
-        } else {
             return true;
+        } else {
+            return false;
         }
     } else {
         // In this case end < begin because it has wrap around the limits