diff --git a/src/lib/Preview.js b/src/lib/Preview.js
index 1197f184bf..ca13164845 100644
--- a/src/lib/Preview.js
+++ b/src/lib/Preview.js
@@ -1187,7 +1187,7 @@ class Preview extends EventEmitter {
         }
 
         // Determine the viewer to use
-        const viewer = loader.determineViewer(this.file, Object.keys(this.disabledViewers));
+        const viewer = loader.determineViewer(this.file, Object.keys(this.disabledViewers), this.options.viewers);
 
         // Log the type of file
         this.logger.setType(viewer.NAME);
diff --git a/src/lib/viewers/office/OfficeLoader.js b/src/lib/viewers/office/OfficeLoader.js
index 07edbb7ca8..9f1fbfbd71 100644
--- a/src/lib/viewers/office/OfficeLoader.js
+++ b/src/lib/viewers/office/OfficeLoader.js
@@ -1,3 +1,4 @@
+import get from 'lodash/get';
 import AssetLoader from '../AssetLoader';
 import OfficeViewer from './OfficeViewer';
 import { checkPermission } from '../../file';
@@ -29,14 +30,15 @@ class OfficeLoader extends AssetLoader {
     /**
      * @inheritdoc
      */
-    determineViewer(file, disabledViewers = []) {
+    determineViewer(file, disabledViewers = [], viewerOptions = {}) {
         // The Office viewer is disabled when this is a password protected shared link
         const isDisabledDueToPasswordProtectedSharedLink = file.shared_link && file.shared_link.is_password_enabled;
-        // If the user does not have permission to download the file, the file is larger than 5MB, or isDisabledDueToSharedLink is true,
-        // then disable the Office viewer
+        // If the user does not have permission to download the file, the file is larger than Appconf file size or 5MB,
+        // or isDisabledDueToSharedLink is true, then disable the Office viewer
+        const maxFileSize = get(viewerOptions, 'office.excelOnlineAllowedMaxFileSize') || FIVE_MB;
         if (
             !checkPermission(file, PERMISSION_DOWNLOAD) ||
-            file.size > FIVE_MB ||
+            file.size > maxFileSize ||
             isDisabledDueToPasswordProtectedSharedLink
         ) {
             disabledViewers.push(OFFICE_VIEWER_NAME);
diff --git a/src/lib/viewers/office/__tests__/OfficeLoader-test.js b/src/lib/viewers/office/__tests__/OfficeLoader-test.js
index 6f92fcbd33..53f8dfa5fe 100644
--- a/src/lib/viewers/office/__tests__/OfficeLoader-test.js
+++ b/src/lib/viewers/office/__tests__/OfficeLoader-test.js
@@ -3,6 +3,8 @@ import OfficeViewer from '../OfficeViewer';
 import * as file from '../../../file';
 import { PERMISSION_DOWNLOAD } from '../../../constants';
 
+const FIVE_MB = 5242880;
+
 const sandbox = sinon.sandbox.create();
 
 describe('lib/viewers/office/OfficeLoader', () => {
@@ -43,9 +45,11 @@ describe('lib/viewers/office/OfficeLoader', () => {
             });
 
             it('should choose the Office viewer if it is not disabled and the file is a shared link that is not password-protected', () => {
-                const editedFakeFile = fakeFile;
-                editedFakeFile.shared_link = {
-                    is_password_enabled: false,
+                const editedFakeFile = {
+                    ...fakeFile,
+                    shared_link: {
+                        is_password_enabled: false,
+                    },
                 };
                 const viewer = OfficeLoader.determineViewer(editedFakeFile);
                 expect(viewer.NAME).to.equal('Office');
@@ -57,8 +61,7 @@ describe('lib/viewers/office/OfficeLoader', () => {
             });
 
             it('should not return a viewer if the file is too large', () => {
-                const editedFakeFile = fakeFile;
-                editedFakeFile.size = 5242881;
+                const editedFakeFile = { ...fakeFile, size: FIVE_MB + 1 };
                 const viewer = OfficeLoader.determineViewer(editedFakeFile, []);
                 expect(viewer).to.equal(undefined);
             });
@@ -73,13 +76,26 @@ describe('lib/viewers/office/OfficeLoader', () => {
             });
 
             it('should not return a viewer if the file is a password-protected shared link', () => {
-                const editedFakeFile = fakeFile;
-                editedFakeFile.shared_link = {
-                    is_password_enabled: true,
+                const editedFakeFile = {
+                    ...fakeFile,
+                    shared_link: {
+                        is_password_enabled: true,
+                    },
                 };
                 const viewer = OfficeLoader.determineViewer(editedFakeFile, []);
                 expect(viewer).to.equal(undefined);
             });
+
+            it('should respect maxFileSize in viewerOptions', () => {
+                const viewerOptions = {
+                    office: {
+                        excelOnlineAllowedMaxFileSize: FIVE_MB + 1,
+                    },
+                };
+                const editedFakeFile = { ...fakeFile, size: FIVE_MB + 1 };
+                const viewer = OfficeLoader.determineViewer(editedFakeFile, [], viewerOptions);
+                expect(viewer).to.not.equal(undefined);
+            });
         });
     });
 });