diff --git a/Mf2/Parser.php b/Mf2/Parser.php
index 7048794..c436c2d 100644
--- a/Mf2/Parser.php
+++ b/Mf2/Parser.php
@@ -1166,7 +1166,8 @@ public function parseH(\DOMElement $e, $is_backcompat = false, $has_nested_mf =
 			}
 		}
 
-		// Make sure things are in alphabetical order
+		// Make sure things are unique and in alphabetical order
+		$mfTypes = array_unique($mfTypes);
 		sort($mfTypes);
 
 		// Phew. Return the final result.
diff --git a/tests/Mf2/ParserTest.php b/tests/Mf2/ParserTest.php
index e5767ab..8d1304b 100644
--- a/tests/Mf2/ParserTest.php
+++ b/tests/Mf2/ParserTest.php
@@ -766,5 +766,15 @@ public function testMfClassRegex() {
 		$this->assertArrayHasKey('123-url', $output['items'][0]['properties']);
 	}
 
+	/**
+	 * @see https://github.com/microformats/microformats2-parsing/issues/30
+	 */
+	public function testUniqueAndAlphabeticalMfClasses() {
+		$input = '<div class="h-entry h-cite h-entry"></div>';
+		$output = Mf2\parse($input);
+
+		$this->assertEquals(array('h-cite', 'h-entry'), $output['items'][0]['type']);
+	}
+
 }