diff --git a/build/azure-pipelines/upload-nlsmetadata.js b/build/azure-pipelines/upload-nlsmetadata.js
index fd69b9a8c36..c92cd277d85 100644
--- a/build/azure-pipelines/upload-nlsmetadata.js
+++ b/build/azure-pipelines/upload-nlsmetadata.js
@@ -20,6 +20,7 @@ function main() {
             .pipe(merge({
             fileName: 'combined.nls.metadata.json',
             jsonSpace: '',
+            concatArrays: true,
             edit: (parsedJson, file) => {
                 if (file.base === 'out-vscode-web-min') {
                     return { vscode: parsedJson };
diff --git a/build/azure-pipelines/upload-nlsmetadata.ts b/build/azure-pipelines/upload-nlsmetadata.ts
index 100f5d9cfd5..4749e1f9605 100644
--- a/build/azure-pipelines/upload-nlsmetadata.ts
+++ b/build/azure-pipelines/upload-nlsmetadata.ts
@@ -33,6 +33,7 @@ function main(): Promise<void> {
 			.pipe(merge({
 				fileName: 'combined.nls.metadata.json',
 				jsonSpace: '',
+				concatArrays: true,
 				edit: (parsedJson, file) => {
 					if (file.base === 'out-vscode-web-min') {
 						return { vscode: parsedJson };