diff --git a/src/html.ts b/src/html.ts
index 827226a1..c9ebc147 100644
--- a/src/html.ts
+++ b/src/html.ts
@@ -76,11 +76,11 @@ export var language = <ILanguage> {
 		root: [
 			[/<!DOCTYPE/, 'metatag', '@doctype'],
 			[/<!--/, 'comment', '@comment'],
-			[/(<)(\w+)(\/>)/, [htmlTokenTypes.DELIM_START, 'tag', htmlTokenTypes.DELIM_END]],
+			[/(<)((?:[\w\-]+:)?[\w\-]+)(\s*)(\/>)/, [htmlTokenTypes.DELIM_START, 'tag', '', htmlTokenTypes.DELIM_END]],
 			[/(<)(script)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@script'} ]],
 			[/(<)(style)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@style'} ]],
-			[/(<)([:\w]+)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@otherTag'} ]],
-			[/(<\/)(\w+)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@otherTag' }]],
+			[/(<)((?:[\w\-]+:)?[\w\-]+)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@otherTag' }]],
+			[/(<\/)((?:[\w\-]+:)?[\w\-]+)/, [htmlTokenTypes.DELIM_START, { token: 'tag', next: '@otherTag' }]],
 			[/</, htmlTokenTypes.DELIM_START],
 			[/[^<]+/], // text
 		],
diff --git a/test/html.test.ts b/test/html.test.ts
index 8ca0ef85..6ae085ff 100644
--- a/test/html.test.ts
+++ b/test/html.test.ts
@@ -599,5 +599,19 @@ testTokenization(['html', 'css'], [
 			{ startIndex:0, type: DOCTYPE },
 			{ startIndex:11, type: DELIM_DOCTYPE }
 		]
+	}],
+
+	// PR #14
+	[{
+		line: '<asdf:bar>asd</asdf:bar>',
+		tokens: [
+			{ startIndex:0, type: DELIM_START },
+			{ startIndex:1, type: getTag('asdf:bar') },
+			{ startIndex:9, type: DELIM_END },
+			{ startIndex:10, type: '' },
+			{ startIndex:13, type: DELIM_START },
+			{ startIndex:15, type: getTag('asdf:bar') },
+			{ startIndex:23, type: DELIM_END }
+		]
 	}]
 ]);