diff --git a/src/ecmascript/quickjs/console.cpp b/src/ecmascript/quickjs/console.cpp
index a7b760c57..0eda22e1d 100644
--- a/src/ecmascript/quickjs/console.cpp
+++ b/src/ecmascript/quickjs/console.cpp
@@ -166,7 +166,7 @@ js_console_init(JSContext *ctx)
 	JS_SetConstructor(ctx, console_class, console_proto);
 	JS_SetClassProto(ctx, js_console_class_id, console_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "console", console_proto);
+	JS_SetPropertyStr(ctx, global_obj, "console", JS_DupValue(ctx, console_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/document.cpp b/src/ecmascript/quickjs/document.cpp
index b1d33e6a4..ab1523926 100644
--- a/src/ecmascript/quickjs/document.cpp
+++ b/src/ecmascript/quickjs/document.cpp
@@ -1752,7 +1752,7 @@ js_document_init(JSContext *ctx)
 	JS_SetConstructor(ctx, document_class, document_proto);
 	JS_SetClassProto(ctx, js_document_class_id, document_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "document", document_proto);
+	JS_SetPropertyStr(ctx, global_obj, "document", JS_DupValue(ctx, document_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/history.cpp b/src/ecmascript/quickjs/history.cpp
index 59dfdf895..070c43737 100644
--- a/src/ecmascript/quickjs/history.cpp
+++ b/src/ecmascript/quickjs/history.cpp
@@ -201,7 +201,7 @@ js_history_init(JSContext *ctx)
 	JS_SetConstructor(ctx, history_class, history_proto);
 	JS_SetClassProto(ctx, js_history_class_id, history_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "history", history_proto);
+	JS_SetPropertyStr(ctx, global_obj, "history", JS_DupValue(ctx, history_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/localstorage.cpp b/src/ecmascript/quickjs/localstorage.cpp
index fc2be3184..963eaa31f 100644
--- a/src/ecmascript/quickjs/localstorage.cpp
+++ b/src/ecmascript/quickjs/localstorage.cpp
@@ -252,9 +252,13 @@ js_localstorage_init(JSContext *ctx)
 	REF_JS(localstorage_obj);
 
 	JS_SetPropertyFunctionList(ctx, localstorage_obj, js_localstorage_proto_funcs, countof(js_localstorage_proto_funcs));
-	JS_SetClassProto(ctx, js_localstorage_class_id, localstorage_obj);
+	REF_JS(localstorage_obj);
 
-	JS_SetPropertyStr(ctx, global_obj, "localStorage", localstorage_obj);
+	JS_SetClassProto(ctx, js_localstorage_class_id, localstorage_obj);
+	REF_JS(localstorage_obj);
+
+	JS_SetPropertyStr(ctx, global_obj, "localStorage", JS_DupValue(ctx, localstorage_obj));
+	REF_JS(localstorage_obj);
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/location.cpp b/src/ecmascript/quickjs/location.cpp
index decaf1aac..461a9e392 100644
--- a/src/ecmascript/quickjs/location.cpp
+++ b/src/ecmascript/quickjs/location.cpp
@@ -703,7 +703,7 @@ js_location_init(JSContext *ctx)
 	JS_SetConstructor(ctx, location_class, location_proto);
 	JS_SetClassProto(ctx, js_location_class_id, location_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "location", location_proto);
+	JS_SetPropertyStr(ctx, global_obj, "location", JS_DupValue(ctx, location_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/navigator.cpp b/src/ecmascript/quickjs/navigator.cpp
index 03f0c1ad6..2d22d112d 100644
--- a/src/ecmascript/quickjs/navigator.cpp
+++ b/src/ecmascript/quickjs/navigator.cpp
@@ -228,7 +228,7 @@ js_navigator_init(JSContext *ctx)
 	JS_SetConstructor(ctx, navigator_class, navigator_proto);
 	JS_SetClassProto(ctx, js_navigator_class_id, navigator_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "navigator", navigator_proto);
+	JS_SetPropertyStr(ctx, global_obj, "navigator", JS_DupValue(ctx, navigator_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/screen.cpp b/src/ecmascript/quickjs/screen.cpp
index 9107f6b01..1a4a667aa 100644
--- a/src/ecmascript/quickjs/screen.cpp
+++ b/src/ecmascript/quickjs/screen.cpp
@@ -217,7 +217,7 @@ js_screen_init(JSContext *ctx)
 	JS_SetConstructor(ctx, screen_class, screen_proto);
 	JS_SetClassProto(ctx, js_screen_class_id, screen_proto);
 
-	JS_SetPropertyStr(ctx, global_obj, "screen", screen_proto);
+	JS_SetPropertyStr(ctx, global_obj, "screen", JS_DupValue(ctx, screen_proto));
 
 	JS_FreeValue(ctx, global_obj);
 
diff --git a/src/ecmascript/quickjs/unibar.cpp b/src/ecmascript/quickjs/unibar.cpp
index 41564fd3e..f8bef2ed3 100644
--- a/src/ecmascript/quickjs/unibar.cpp
+++ b/src/ecmascript/quickjs/unibar.cpp
@@ -234,7 +234,7 @@ js_unibar_init(JSContext *ctx)
 	/* set proto.constructor and ctor.prototype */
 	JS_SetConstructor(ctx, menubar_class, menubar_proto);
 	JS_SetClassProto(ctx, js_menubar_class_id, menubar_proto);
-	JS_SetPropertyStr(ctx, global_obj, "menubar", menubar_proto);
+	JS_SetPropertyStr(ctx, global_obj, "menubar", JS_DupValue(ctx, menubar_proto));
 
 	/* create the statusbar class */
 	JS_NewClassID(&js_statusbar_class_id);
@@ -250,7 +250,7 @@ js_unibar_init(JSContext *ctx)
 	/* set proto.constructor and ctor.prototype */
 	JS_SetConstructor(ctx, statusbar_class, statusbar_proto);
 	JS_SetClassProto(ctx, js_statusbar_class_id, statusbar_proto);
-	JS_SetPropertyStr(ctx, global_obj, "statusbar", statusbar_proto);
+	JS_SetPropertyStr(ctx, global_obj, "statusbar", JS_DupValue(ctx, statusbar_proto));
 
 	JS_FreeValue(ctx, global_obj);