diff --git a/src/display/canvas.js b/src/display/canvas.js
index 09beae8ad..e9b356356 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -870,6 +870,11 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
     },
 
     endDrawing: function CanvasGraphics_endDrawing() {
+      // Finishing all opened operations such as SMask group painting.
+      if (this.current.activeSMask !== null) {
+        this.endSMaskGroup();
+      }
+
       this.ctx.restore();
 
       if (this.transparentCanvas) {