diff --git a/examples/common/entry/entry_html5.cpp b/examples/common/entry/entry_html5.cpp
index 6482942ff..557d8bcb6 100644
--- a/examples/common/entry/entry_html5.cpp
+++ b/examples/common/entry/entry_html5.cpp
@@ -101,8 +101,6 @@ namespace entry
 		{
 			static const char* canvas = "#canvas";
 
-			EMSCRIPTEN_CHECK(emscripten_set_mousedown_callback(canvas, this, true, mouseCb) );
-
 			EMSCRIPTEN_CHECK(emscripten_set_mousedown_callback(canvas, this, true, mouseCb) );
 			EMSCRIPTEN_CHECK(emscripten_set_mouseup_callback(canvas, this, true, mouseCb) );
 			EMSCRIPTEN_CHECK(emscripten_set_mousemove_callback(canvas, this, true, mouseCb) );