diff --git a/extensions/json/server/src/jsonServerMain.ts b/extensions/json/server/src/jsonServerMain.ts
index 3137b954d36c19a4aa57d6835c2ceab7d701bfe6..9b01f30cd7dcbc9f1c2886fbfd646ba98a48c79e 100644
--- a/extensions/json/server/src/jsonServerMain.ts
+++ b/extensions/json/server/src/jsonServerMain.ts
@@ -74,7 +74,7 @@ connection.onInitialize((params: InitializeParams): InitializeResult => {
 	let capabilities: ServerCapabilities & CPServerCapabilities = {
 		// Tell the client that the server works in FULL text document sync mode
 		textDocumentSync: documents.syncKind,
-		completionProvider: clientSnippetSupport ? { resolveProvider: true, triggerCharacters: ['"', ':'] } : null,
+		completionProvider: clientSnippetSupport ? { resolveProvider: true, triggerCharacters: ['"', ':'] } : void 0,
 		hoverProvider: true,
 		documentSymbolProvider: true,
 		documentRangeFormattingProvider: false,