diff --git a/js/Date.js b/js/Date.js
index c4d703ef..35815a52 100644
--- a/js/Date.js
+++ b/js/Date.js
@@ -97,7 +97,7 @@ Flotr.Date = {
       ticks     = [],
       tickSize  = axis.tickSize,
       tickUnit,
-      formatter, i;
+      formatter, i ,d;
 
     // Use custom formatter or time tick formatter
     formatter = (options.tickFormatter === Flotr.defaultTickFormatter ?
@@ -105,7 +105,7 @@ Flotr.Date = {
     );
 
     for (i = 0; i < spec.length - 1; ++i) {
-      var d = spec[i][0] * timeUnits[spec[i][1]];
+      d = spec[i][0] * timeUnits[spec[i][1]];
       if (delta < (d + spec[i+1][0] * timeUnits[spec[i+1][1]]) / 2 && d >= tickSize)
         break;
     }
@@ -127,7 +127,7 @@ Flotr.Date = {
     axis.tickSize = tickSize;
 
     var step = tickSize * timeUnits[tickUnit];
-    var d = new Date(min);
+    d = new Date(min);
 
     function setTick (name) {
       set(d, name, mode, Flotr.floorInBase(