diff --git a/lodash.js b/lodash.js
index 9315671a8..1511149b3 100644
--- a/lodash.js
+++ b/lodash.js
@@ -9606,7 +9606,7 @@
           maxWait,
           result,
           timerId,
-          lastCallTime = 0,
+          lastCallTime,
           lastInvokeTime = 0,
           leading = false,
           maxing = false,
@@ -9657,7 +9657,7 @@
         // Either this is the first call, activity has stopped and we're at the
         // trailing edge, the system time has gone backwards and we're treating
         // it as the trailing edge, or we've hit the `maxWait` limit.
-        return (!lastCallTime || (timeSinceLastCall >= wait) ||
+        return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
           (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
       }
 
@@ -9687,8 +9687,8 @@
         if (timerId !== undefined) {
           clearTimeout(timerId);
         }
-        lastCallTime = lastInvokeTime = 0;
-        lastArgs = lastThis = timerId = undefined;
+        lastInvokeTime = 0;
+        lastArgs = lastCallTime = lastThis = timerId = undefined;
       }
 
       function flush() {