diff --git a/src/bin/build-keycloak-theme/generateFtl/index.ts b/src/bin/build-keycloak-theme/generateFtl/index.ts
index 691905b7..acd673aa 100644
--- a/src/bin/build-keycloak-theme/generateFtl/index.ts
+++ b/src/bin/build-keycloak-theme/generateFtl/index.ts
@@ -131,11 +131,11 @@ export function generateFtlFilesCodeFactory(
                 pageSpecificCodePlaceholder,
                 [
                     '<script>',
-                    `    Object.assign(`,
+                    `    Object.deepAssign(`,
                     `        window.${ftlValuesGlobalName},`,
                     `        { "pageId": "${pageId}" }`,
                     '    );',
-                    `    Object.assign(`,
+                    `    Object.deepAssign(`,
                     `        window.${ftlValuesGlobalName},`,
                     `        ${objectKeys(ftlPlaceholders)[0]}`,
                     '    );',