diff --git a/src/core/js/ext_revisions.js b/src/core/js/ext_revisions.js
index 1a69fa8f975e4acc1b2ba1327b83251418692def..981156929ce96cb12a9a3eaa6a85c27c8bf0907f 100644
--- a/src/core/js/ext_revisions.js
+++ b/src/core/js/ext_revisions.js
@@ -215,7 +215,7 @@ var ext_revisions = function ($, logger, edit_mode, getEntityID, transaction, _c
 
 // this will be replaced by require.js in the future.
 $(document).ready(function () {
-    if ("$BUILD_MODULE_EXT_REVISIONS" == "ENABLED") {
+    if ("${BUILD_MODULE_EXT_REVISIONS}" == "ENABLED") {
         caosdb_modules.register(ext_revisions);
     }
 });