diff --git a/lib/bom.js b/lib/bom.js
index 0f1eed349fc..ecbc8a22010 100644
--- a/lib/bom.js
+++ b/lib/bom.js
@@ -699,6 +699,7 @@ declare class BaseAudioContext {
   createBiquadFilter(): BiquadFilterNode;
   createChannelMerger(numberOfInputs?: number): ChannelMergerNode;
   createChannelSplitter(numberOfInputs?: number): ChannelSplitterNode;
+  createConstantSource(): ConstantSourceNode;
   createConvolver(): ConvolverNode;
   createDelay(maxDelayTime?: number): DelayNode;
   createDynamicsCompressor(): DynamicsCompressorNode;
@@ -904,6 +905,18 @@ declare class BiquadFilterNode extends AudioNode {
 
 declare class ChannelMergerNode extends AudioNode {}
 declare class ChannelSplitterNode extends AudioNode {}
+
+type ConstantSourceOptions = {
+  offset?: number;
+}
+declare class ConstantSourceNode extends AudioNode {
+  constructor(context: BaseAudioContext, options?: ConstantSourceOptions): ConstantSourceNode;
+  offset: AudioParam;
+  onended: (ev: any) => any;
+  start(when?: number): void;
+  stop(when?: number): void;
+}
+
 declare class ConvolverNode extends AudioNode {
   buffer: AudioBuffer;
   normalize: bool;