diff --git a/core/ViewableData.php b/core/ViewableData.php
index c9ab478a3..37e942dd6 100755
--- a/core/ViewableData.php
+++ b/core/ViewableData.php
@@ -611,16 +611,16 @@ class ViewableData extends Object implements IteratorAggregate {
 
 	/**
 	 * Returns the modulus of the numerical position of the item in the data set.
-	 * The count starts from $startIndex, which defaults to 0.
+	 * The count starts from $startIndex, which defaults to 1.
 	 * @param int $Mod The number to perform Mod operation to.
 	 * @param int $startIndex Number to start count from.
 	 * @return int
 	 */
-	public function Modulus($mod, $startIndex = 0) {
+	public function Modulus($mod, $startIndex = 1) {
 		return ($this->iteratorPos + $startIndex) % $mod;
 	}
 	
-	public function MultipleOf($factor, $offset = 0) {
+	public function MultipleOf($factor, $offset = 1) {
 		return ($this->Modulus($factor, $offset) == 0);
 	}
 
diff --git a/tests/DataObjectSetTest.php b/tests/DataObjectSetTest.php
index fdab97a5e..c35c91387 100644
--- a/tests/DataObjectSetTest.php
+++ b/tests/DataObjectSetTest.php
@@ -108,7 +108,7 @@ class DataObjectSetTest extends SapphireTest {
 	public function testMultipleOf() {
 		$comments = DataObject::get('PageComment', '', "\"ID\" ASC");
 		$commArr = $comments->toArray();
-		$multiplesOf3 = 0;
+		$multiplesOf3 = 1;
 		
 		foreach($comments as $comment) {
 			if($comment->MultipleOf(3)) {
@@ -121,13 +121,13 @@ class DataObjectSetTest extends SapphireTest {
 		
 		$this->assertEquals(3, $multiplesOf3);
 		
-		$this->assertTrue($commArr[0]->IsMultipleOf3);
+		$this->assertFalse($commArr[0]->IsMultipleOf3);
 		$this->assertFalse($commArr[1]->IsMultipleOf3);
-		$this->assertFalse($commArr[2]->IsMultipleOf3);
-		$this->assertTrue($commArr[3]->IsMultipleOf3);
+		$this->assertTrue($commArr[2]->IsMultipleOf3);
+		$this->assertFalse($commArr[3]->IsMultipleOf3);
 		$this->assertFalse($commArr[4]->IsMultipleOf3);
-		$this->assertFalse($commArr[5]->IsMultipleOf3);
-		$this->assertTrue($commArr[6]->IsMultipleOf3);
+		$this->assertTrue($commArr[5]->IsMultipleOf3);
+		$this->assertFalse($commArr[6]->IsMultipleOf3);
 
 		foreach($comments as $comment) {
 			if($comment->MultipleOf(3, 1)) {