diff --git a/src/mfm/parser.ts b/src/mfm/parser.ts
index 205d5ede1a..50877bcdb5 100644
--- a/src/mfm/parser.ts
+++ b/src/mfm/parser.ts
@@ -205,7 +205,7 @@ const mfm = P.createLanguage({
 	hashtag: r =>
 		P((input, i) => {
 			const text = input.substr(i);
-			const match = text.match(/^#([^\s\.,!\?#]+)/i);
+			const match = text.match(/^#([^\s\.,!\?#:]+)/i);
 			if (!match) return P.makeFailure(i, 'not a hashtag');
 			let hashtag = match[1];
 			hashtag = removeOrphanedBrackets(hashtag);
diff --git a/test/mfm.ts b/test/mfm.ts
index 6bbbe146ca..7e2de47339 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -357,6 +357,14 @@ describe('MFM', () => {
 				]);
 			});
 
+			it('ignore colon', () => {
+				const tokens = analyze('#Foo:');
+				assert.deepStrictEqual(tokens, [
+					leaf('hashtag', { hashtag: 'Foo' }),
+					text(':'),
+				]);
+			});
+
 			it('allow including number', () => {
 				const tokens = analyze('#foo123');
 				assert.deepStrictEqual(tokens, [