diff --git a/library/Zend/Filter/Digits.php b/library/Zend/Filter/Digits.php
index eea9b58a7a8..c5e856fbd58 100644
--- a/library/Zend/Filter/Digits.php
+++ b/library/Zend/Filter/Digits.php
@@ -18,14 +18,17 @@ class Digits extends AbstractFilter
      *
      * Returns the string $value, removing all but digit characters
      *
-     * If the value provided is non-scalar, the value will remain unfiltered
+     * If the value provided is not integer, float or string, the value will remain unfiltered
      *
      * @param  string $value
      * @return string|mixed
      */
     public function filter($value)
     {
-        if (!is_scalar($value)) {
+        if (is_int($value)) {
+            return (string) $value;
+        }
+        if (! (is_float($value) || is_string($value))) {
             return $value;
         }
         $value = (string) $value;
diff --git a/tests/ZendTest/Filter/DigitsTest.php b/tests/ZendTest/Filter/DigitsTest.php
index 7c478b3cd68..a405f07fda8 100644
--- a/tests/ZendTest/Filter/DigitsTest.php
+++ b/tests/ZendTest/Filter/DigitsTest.php
@@ -90,7 +90,9 @@ public function returnUnfilteredDataProvider()
             array(array(
                 'abc123',
                 'abc 123'
-            ))
+            )),
+            array(true),
+            array(false),
         );
     }
 
@@ -102,6 +104,6 @@ public function testReturnUnfiltered($input)
     {
         $filter = new DigitsFilter();
 
-        $this->assertEquals($input, $filter($input));
+        $this->assertSame($input, $filter($input));
     }
 }