diff --git a/src/renderers/WebGLRenderTarget.js b/src/renderers/WebGLRenderTarget.js
index 39b31632684316..62552e07905ed8 100644
--- a/src/renderers/WebGLRenderTarget.js
+++ b/src/renderers/WebGLRenderTarget.js
@@ -34,6 +34,7 @@ class WebGLRenderTarget extends EventDispatcher {
 
 		this.depthBuffer = options.depthBuffer !== undefined ? options.depthBuffer : true;
 		this.stencilBuffer = options.stencilBuffer !== undefined ? options.stencilBuffer : false;
+
 		this.depthTexture = options.depthTexture !== undefined ? options.depthTexture : null;
 
 	}
@@ -93,7 +94,8 @@ class WebGLRenderTarget extends EventDispatcher {
 
 		this.depthBuffer = source.depthBuffer;
 		this.stencilBuffer = source.stencilBuffer;
-		this.depthTexture = source.depthTexture;
+
+		if ( source.depthTexture !== null ) this.depthTexture = source.depthTexture.clone();
 
 		return this;