diff --git a/media/js/jquery.dataTables.js b/media/js/jquery.dataTables.js
index 5f4911cb..ec5040ff 100644
--- a/media/js/jquery.dataTables.js
+++ b/media/js/jquery.dataTables.js
@@ -81,7 +81,7 @@
 			oSettings.aoColumns.push( oCol );
 			
 			/* Add a column specific filter */
-			if ( oSettings.aoPreSearchCols[ iCol ] !== undefined )
+			if ( oSettings.aoPreSearchCols[ iCol ] === undefined )
 			{
 				oSettings.aoPreSearchCols[ iCol ] = $.extend( {}, DataTable.models.oSearch );
 			}
diff --git a/media/src/core/core.columns.js b/media/src/core/core.columns.js
index e26a1268..cac53c97 100644
--- a/media/src/core/core.columns.js
+++ b/media/src/core/core.columns.js
@@ -21,7 +21,7 @@ function _fnAddColumn( oSettings, nTh )
 	oSettings.aoColumns.push( oCol );
 	
 	/* Add a column specific filter */
-	if ( oSettings.aoPreSearchCols[ iCol ] !== undefined )
+	if ( oSettings.aoPreSearchCols[ iCol ] === undefined )
 	{
 		oSettings.aoPreSearchCols[ iCol ] = $.extend( {}, DataTable.models.oSearch );
 	}