diff --git a/index.d.ts b/index.d.ts
index 97a8680..815893a 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -2,7 +2,7 @@ import {editor, Position, CancellationToken, languages} from "monaco-editor";
 
 declare class SqlCompletionItemProvider {
     public triggerCharacters: string[];
-    provideCompletionItems(model: editor.ITextModel, position: Position, context: languages.CompletionContext, token: CancellationToken);
+    provideCompletionItems(model: editor.ITextModel, position: Position, context: languages.CompletionContext, token: CancellationToken) : languages.ProviderResult<languages.CompletionList>;
 }
 
 declare class ErrorMarkProvider {
diff --git a/src/providers/SqlCompletionItemProvider.ts b/src/providers/SqlCompletionItemProvider.ts
index 3d28604..e410fe8 100644
--- a/src/providers/SqlCompletionItemProvider.ts
+++ b/src/providers/SqlCompletionItemProvider.ts
@@ -4,7 +4,7 @@ import {editor, Position, CancellationToken, languages} from "monaco-editor";
 export class SqlCompletionItemProvider {
     public triggerCharacters: string[] = [" ","."];
     
-    provideCompletionItems(model: editor.IReadOnlyModel, position: Position, context: languages.CompletionContext, token: CancellationToken) {      
+    provideCompletionItems(model: editor.IReadOnlyModel, position: Position, context: languages.CompletionContext, token: CancellationToken) : languages.ProviderResult<languages.CompletionList> {      
         const range = {
             startLineNumber: 1,
             startColumn: 1,