diff --git a/test/datascript/test/core.cljc b/test/datascript/test/core.cljc
index 9fcd6986..2c759a5c 100644
--- a/test/datascript/test/core.cljc
+++ b/test/datascript/test/core.cljc
@@ -94,10 +94,11 @@
      :cljs (.getTime (js/Date.))))
 
 (deftest test-uuid
-  (loop []
-    (when (> (mod (now) 1000) 990) ;; sleeping over end of a second
-      (recur)))
-  (let [now-ms (now)
+  (let [now-ms (loop []
+                 (let [ts (now)]
+                   (if (> (mod ts 1000) 900) ;; sleeping over end of a second
+                     (recur)
+                     ts)))
         now    (int (/ now-ms 1000))]
     (is (= (* 1000 now) (d/squuid-time-millis (d/squuid))))
     (is (not= (d/squuid) (d/squuid)))