diff --git a/ghost/core/test/e2e-api/admin/__snapshots__/posts.test.js.snap b/ghost/core/test/e2e-api/admin/__snapshots__/posts.test.js.snap
index 793ddcb0c3..48423fa5f2 100644
--- a/ghost/core/test/e2e-api/admin/__snapshots__/posts.test.js.snap
+++ b/ghost/core/test/e2e-api/admin/__snapshots__/posts.test.js.snap
@@ -648,7 +648,7 @@ exports[`Posts API Update Can update a post with lexical 4: [headers] 1`] = `
 Object {
   "access-control-allow-origin": "http://127.0.0.1:2369",
   "cache-control": "no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0",
-  "content-length": "3691",
+  "content-length": StringMatching /\\\\d\\+/,
   "content-type": "application/json; charset=utf-8",
   "etag": StringMatching /\\(\\?:W\\\\/\\)\\?"\\(\\?:\\[ !#-\\\\x7E\\\\x80-\\\\xFF\\]\\*\\|\\\\r\\\\n\\[\\\\t \\]\\|\\\\\\\\\\.\\)\\*"/,
   "vary": "Origin, Accept-Encoding",
diff --git a/ghost/core/test/e2e-api/admin/posts.test.js b/ghost/core/test/e2e-api/admin/posts.test.js
index 3eb9a0872a..5d0cba7e02 100644
--- a/ghost/core/test/e2e-api/admin/posts.test.js
+++ b/ghost/core/test/e2e-api/admin/posts.test.js
@@ -1,7 +1,7 @@
 const should = require('should');
 const assert = require('assert');
 const {agentProvider, fixtureManager, mockManager, matchers} = require('../../utils/e2e-framework');
-const {anyArray, anyEtag, anyErrorId, anyLocationFor, anyObject, anyObjectId, anyISODateTime, anyString, anyUuid, stringMatching} = matchers;
+const {anyArray, anyEtag, anyErrorId, anyLocationFor, anyObject, anyObjectId, anyISODateTime, anyString, anyStringNumber, anyUuid, stringMatching} = matchers;
 const models = require('../../../core/server/models');
 
 const matchPostShallowIncludes = {
@@ -291,7 +291,8 @@ describe('Posts API', function () {
                 })
                 .matchHeaderSnapshot({
                     etag: anyEtag,
-                    'x-cache-invalidate': anyString
+                    'x-cache-invalidate': anyString,
+                    'content-length': anyStringNumber
                 });
 
             // post revisions are created