diff --git a/services/web/Makefile b/services/web/Makefile
index bed0b27a0c..390e2faea8 100644
--- a/services/web/Makefile
+++ b/services/web/Makefile
@@ -423,6 +423,10 @@ lint: lint_flag_res_send_usage
 lint_flag_res_send_usage:
 	bin/lint_flag_res_send_usage
 
+lint: lint_overleafModuleImports
+lint_overleafModuleImports:
+	node scripts/check_overleafModuleImports.js
+
 lint: typecheck_frontend
 typecheck_frontend:
 	npx -p typescript tsc --noEmit
diff --git a/services/web/config/settings.defaults.js b/services/web/config/settings.defaults.js
index e96178fd0a..2bd74880ac 100644
--- a/services/web/config/settings.defaults.js
+++ b/services/web/config/settings.defaults.js
@@ -881,6 +881,7 @@ module.exports = {
     sourceEditorComponents: [],
     pdfLogEntryComponents: [],
     pdfLogEntriesComponents: [],
+    pdfPreviewPromotions: [],
     diagnosticActions: [],
     sourceEditorCompletionSources: [],
     sourceEditorSymbolPalette: [],
diff --git a/services/web/scripts/check_overleafModuleImports.js b/services/web/scripts/check_overleafModuleImports.js
new file mode 100644
index 0000000000..7af34008c6
--- /dev/null
+++ b/services/web/scripts/check_overleafModuleImports.js
@@ -0,0 +1,26 @@
+function getOverleafModuleImports(settings) {
+  return Object.keys(settings.overleafModuleImports).sort().join(',')
+}
+
+const CE_CONFIG = require('../config/settings.defaults')
+const PRO_CONFIG = require('../config/settings.overrides.server-pro')
+const SAAS_CONFIG = require('../config/settings.webpack')
+
+function main() {
+  const CE = getOverleafModuleImports(CE_CONFIG)
+  const PRO = getOverleafModuleImports(CE_CONFIG.mergeWith(PRO_CONFIG))
+  const SAAS = getOverleafModuleImports(CE_CONFIG.mergeWith(SAAS_CONFIG))
+
+  if (CE !== PRO) {
+    throw new Error(
+      'settings.defaults is missing overleafModuleImports defined in settings.overrides.server-pro'
+    )
+  }
+  if (CE !== SAAS) {
+    throw new Error(
+      'settings.defaults is missing overleafModuleImports defined in settings.webpack'
+    )
+  }
+}
+
+main()