diff --git a/server/src/utils/misc.test.ts b/server/src/utils/misc.test.ts
index 34552a9f8..250c62630 100644
--- a/server/src/utils/misc.test.ts
+++ b/server/src/utils/misc.test.ts
@@ -15,6 +15,7 @@ t.test("#IsValidURL", (t) => {
 	t.ok(IsValidURL("http://example.com/suburl"));
 	t.ok(IsValidURL("http://example.com#href"));
 	t.ok(IsValidURL("http://example.com?querystring"));
+	t.ok(IsValidURL("tachi-fdsaf7324hf://example.com?querystring"));
 
 	t.notOk(IsValidURL("ftp://example.com"));
 
diff --git a/server/src/utils/misc.ts b/server/src/utils/misc.ts
index 7da7c47f3..fba16b958 100644
--- a/server/src/utils/misc.ts
+++ b/server/src/utils/misc.ts
@@ -127,7 +127,11 @@ export function IsValidURL(string: string) {
 	try {
 		const url = new URL(string);
 
-		return url.protocol === "http:" || url.protocol === "https:";
+		return (
+			url.protocol === "http:" ||
+			url.protocol === "https:" ||
+			/^tachi-[a-z0-9]+:$/u.exec(url.protocol)
+		);
 	} catch (_err) {
 		return false;
 	}