diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f117bab5f4..9761853151d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,2 +1,3 @@
 - Enable [preferRest](https://firebase.google.com/docs/reference/admin/node/firebase-admin.firestore.firestoresettings.md#firestoresettingspreferrest) option by default for Firestore functions. (#6147)
 - Fixed a bug where re-deploying 2nd Gen Firestore function failed after updating secrets. (#6456)
+- Fixed a bug where similarly-named Hosting channels would cause issues when updating authorized domains. (#6356)
diff --git a/src/hosting/api.ts b/src/hosting/api.ts
index 552a4ad1927..4b921ff59aa 100644
--- a/src/hosting/api.ts
+++ b/src/hosting/api.ts
@@ -633,8 +633,8 @@ export async function getCleanDomains(project: string, site: string): Promise<st
       return acc;
     }, {});
 
-  // match any string that has ${site}--*
-  const siteMatch = new RegExp(`${site}--`, "i");
+  // match any string that starts with ${site}--*
+  const siteMatch = new RegExp(`^${site}--`, "i");
   // match any string that ends in firebaseapp.com
   const firebaseAppMatch = new RegExp(/firebaseapp.com$/);
   const domains = await getAuthDomains(project);
diff --git a/src/test/hosting/api.spec.ts b/src/test/hosting/api.spec.ts
index 706602e1923..8e0b34329d3 100644
--- a/src/test/hosting/api.spec.ts
+++ b/src/test/hosting/api.spec.ts
@@ -711,6 +711,41 @@ describe("hosting", () => {
       expect(res).to.deep.equal(EXPECTED_DOMAINS_RESPONSE);
       expect(nock.isDone()).to.be.true;
     });
+
+    it("should not remove sites that are similarly named", async () => {
+      // mock listChannels response
+      nock(hostingApiOrigin)
+        .get(`/v1beta1/projects/${PROJECT_ID}/sites/${SITE}/channels`)
+        .query(() => true)
+        .reply(200, {
+          channels: [
+            { url: "https://my-site--ch1-4iyrl1uo.web.app" },
+            { url: "https://my-site--ch2-ygd8582v.web.app" },
+          ],
+        });
+      // mock getAuthDomains response
+      nock(identityOrigin)
+        .get(`/admin/v2/projects/${PROJECT_ID}/config`)
+        .reply(200, {
+          authorizedDomains: [
+            "localhost",
+            "randomurl.com",
+            "my-site--ch1-4iyrl1uo.web.app",
+            "my-site--expiredchannel-difhyc76.web.app",
+            "backendof-my-site--some-abcd1234.web.app",
+          ],
+        });
+
+      const res = await hostingApi.getCleanDomains(PROJECT_ID, SITE);
+
+      expect(res).to.deep.equal([
+        "localhost",
+        "randomurl.com",
+        "my-site--ch1-4iyrl1uo.web.app",
+        "backendof-my-site--some-abcd1234.web.app",
+      ]);
+      expect(nock.isDone()).to.be.true;
+    });
   });
 
   describe("getSiteDomains", () => {