diff --git a/src/session.ts b/src/session.ts
index bdd34f703f..128c27e8b4 100644
--- a/src/session.ts
+++ b/src/session.ts
@@ -542,6 +542,9 @@ export class SessionManager implements Middleware {
                     connectFunc,
                     clientOptions);
 
+            // This enables handling Semantic Highlighting messages in PowerShell Editor Services
+            this.languageServerClient.registerProposedFeatures();
+
             this.languageServerClient.onReady().then(
                 () => {
                     this.languageServerClient
diff --git a/themes/theme-psise/theme.json b/themes/theme-psise/theme.json
index 9f78182bf5..85ffa602b8 100644
--- a/themes/theme-psise/theme.json
+++ b/themes/theme-psise/theme.json
@@ -1,5 +1,6 @@
 {
 	"name": "PowerShell ISE",
+	"semanticHighlighting": true,
 	"tokenColors": [
 		{
 			"settings": {