diff --git a/src/Interfaces.ts b/src/Interfaces.ts
index 22531fa3..943003ae 100644
--- a/src/Interfaces.ts
+++ b/src/Interfaces.ts
@@ -115,7 +115,7 @@ export interface IInputHandlingTerminal extends IEventEmitter {
 
 export interface ITerminalOptions {
   bellSound?: string;
-  bellStyle?: string[];
+  bellStyle?: string;
   cancelEvents?: boolean;
   colors?: string[];
   cols?: number;
diff --git a/src/Terminal.ts b/src/Terminal.ts
index ac00f390..82bb9589 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -2284,15 +2284,11 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
   }
 
   private visualBell(): boolean {
-    let styles = [].concat.apply([], [this.options.bellStyle]);
-
-    return styles.indexOf('visual') > -1 || styles.indexOf('both') > -1;
+    return this.options.bellStyle == 'visual' || this.options.bellStyle == 'both';
   }
 
   private soundBell(): boolean {
-    let styles = [].concat.apply([], [this.options.bellStyle]);
-
-    return styles.indexOf('sound') > -1 || styles.indexOf('both') > -1;
+    return this.options.bellStyle == 'sound' || this.options.bellStyle == 'both';
   }
 
   private preloadBellSound(): void {