diff --git a/slick.grid.js b/slick.grid.js
index c12bae9bb..166327d7f 100644
--- a/slick.grid.js
+++ b/slick.grid.js
@@ -1452,11 +1452,12 @@ if (typeof Slick === "undefined") {
 
     function appendCellHtml(stringArray, row, cell, colspan, item) {
       var m = columns[cell];
-      var cellCss = "slick-cell l" + cell + " r" + Math.min(columns.length - 1, cell + colspan - 1) +
-          (m.cssClass ? " " + m.cssClass : "");
-      if (row === activeRow && cell === activeCell) {
-        cellCss += (" active");
-      }
+      var customCssClass = (typeof (m.cssClass) == 'function' ? m.cssClass(row, cell, item) : m.cssClass) || '';
+
+     var cellCss = "slick-cell l" + cell + " r" + Math.min(columns.length - 1, cell + colspan - 1) +' '+ customCssClass;
+     if (row === activeRow && cell === activeCell) {
+       cellCss += (" active");
+     }
 
       // TODO:  merge them together in the setter
       for (var key in cellCssClasses) {
@@ -1515,7 +1516,7 @@ if (typeof Slick === "undefined") {
       } else {
         $canvas[0].removeChild(cacheEntry.rowNode);
       }
-      
+
       delete rowsCache[row];
       delete postProcessedRows[row];
       renderedRows--;
@@ -2162,7 +2163,7 @@ if (typeof Slick === "undefined") {
           $canvas[0].removeChild(zombieRowNodeFromLastMouseWheelEvent);
           zombieRowNodeFromLastMouseWheelEvent = null;
         }
-        rowNodeFromLastMouseWheelEvent = rowNode;      
+        rowNodeFromLastMouseWheelEvent = rowNode;
       }
     }
 
@@ -2217,7 +2218,7 @@ if (typeof Slick === "undefined") {
             cancelEditAndSetFocus();
           } else if (e.which == 34) {
             navigatePageDown();
-            handled = true;           
+            handled = true;
           } else if (e.which == 33) {
             navigatePageUp();
             handled = true;
@@ -2774,7 +2775,7 @@ if (typeof Slick === "undefined") {
         var prevActivePosX = activePosX;
         while (cell <= activePosX) {
           if (canCellBeActive(row, cell)) {
-            prevCell = cell;  
+            prevCell = cell;
           }
           cell += getColspan(row, cell);
         }