diff --git a/tests/phpunit/includes/testcase.php b/tests/phpunit/includes/testcase.php
index ebf54cef59..eaf5afbf7e 100644
--- a/tests/phpunit/includes/testcase.php
+++ b/tests/phpunit/includes/testcase.php
@@ -144,7 +144,7 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 			}
 		}
 	}
-	
+
 	function flush_cache() {
 		global $wp_object_cache;
 		$wp_object_cache->group_ops = array();
@@ -476,4 +476,12 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		$files = $this->files_in_dir( $uploads['basedir'] );
 		return $files;
 	}
-}
\ No newline at end of file
+
+	/**
+	 * Helper to Convert a microtime string into a float
+	 */
+	protected function _microtime_to_float($microtime ){
+		$time_array = explode( ' ', $microtime );
+		return array_sum( $time_array );
+	}
+}
diff --git a/tests/phpunit/tests/post/getPages.php b/tests/phpunit/tests/post/getPages.php
index 3e351da7f7..6a8d9342a7 100644
--- a/tests/phpunit/tests/post/getPages.php
+++ b/tests/phpunit/tests/post/getPages.php
@@ -79,7 +79,9 @@ class Tests_Post_getPages extends WP_UnitTestCase {
 
 		// This should bump last_changed.
 		wp_delete_post( $pages[0]->ID );
-		$this->assertGreaterThan( $last_changed, wp_cache_get( 'last_changed', 'posts' ) );
+		$old_changed_float = $this->_microtime_to_float( $last_changed );
+		$new_changed_float = $this->_microtime_to_float( wp_cache_get( 'last_changed', 'posts' ) );
+		$this->assertGreaterThan( $old_changed_float, $new_changed_float );
 
 		$num_queries = $wpdb->num_queries;
 		$last_changed = wp_cache_get( 'last_changed', 'posts' );
@@ -282,4 +284,4 @@ class Tests_Post_getPages extends WP_UnitTestCase {
 		$pages = get_pages( array( 'child_of' => $page1, 'meta_key' => 'color', 'meta_value' => 'blue' ) );
 		$this->assertEqualSets( array( $page3 ), wp_list_pluck( $pages, 'ID' ) );
 	}
-}
\ No newline at end of file
+}