diff --git a/src/ecmascript/quickjs/attr.c b/src/ecmascript/quickjs/attr.c
index 8c7b8eee..8c9d542f 100644
--- a/src/ecmascript/quickjs/attr.c
+++ b/src/ecmascript/quickjs/attr.c
@@ -72,7 +72,7 @@ js_attr_get_property_name(JSContext *ctx, JSValueConst this_val)
 		return JS_EXCEPTION;
 	}
 
-	xmlpp::AttributeNode *attr = JS_GetOpaque(this_val, js_attr_class_id);
+	xmlpp::AttributeNode *attr = static_cast<xmlpp::AttributeNode *>(JS_GetOpaque(this_val, js_attr_class_id));
 
 	if (!attr) {
 		return JS_NULL;
@@ -101,7 +101,7 @@ js_attr_get_property_value(JSContext *ctx, JSValueConst this_val)
 		return JS_EXCEPTION;
 	}
 
-	xmlpp::AttributeNode *attr = JS_GetOpaque(this_val, js_attr_class_id);
+	xmlpp::AttributeNode *attr = static_cast<xmlpp::AttributeNode *>(JS_GetOpaque(this_val, js_attr_class_id));
 
 	if (!attr) {
 		return JS_NULL;
diff --git a/src/ecmascript/quickjs/collection.c b/src/ecmascript/quickjs/collection.c
index c1b06f66..d6cd1766 100644
--- a/src/ecmascript/quickjs/collection.c
+++ b/src/ecmascript/quickjs/collection.c
@@ -81,8 +81,7 @@ js_htmlCollection_get_property_length(JSContext *ctx, JSValueConst this_val)
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
-	struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)JS_GetContextOpaque(ctx);
-	xmlpp::Node::NodeSet *ns = js_htmlCollection_GetOpaque(this_val);
+	xmlpp::Node::NodeSet *ns = static_cast<xmlpp::Node::NodeSet *>(js_htmlCollection_GetOpaque(this_val));
 
 	if (!ns) {
 		return JS_NewInt32(ctx, 0);
@@ -97,7 +96,7 @@ js_htmlCollection_item2(JSContext *ctx, JSValueConst this_val, int idx)
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
-	xmlpp::Node::NodeSet *ns = js_htmlCollection_GetOpaque(this_val);
+	xmlpp::Node::NodeSet *ns = static_cast<xmlpp::Node::NodeSet *>(js_htmlCollection_GetOpaque(this_val));
 
 	if (!ns) {
 		return JS_UNDEFINED;
@@ -107,7 +106,7 @@ js_htmlCollection_item2(JSContext *ctx, JSValueConst this_val, int idx)
 
 	try {
 		element = dynamic_cast<xmlpp::Element *>(ns->at(idx));
-	} catch (std::out_of_range e) { return JS_UNDEFINED;}
+	} catch (std::out_of_range &e) { return JS_UNDEFINED;}
 
 	if (!element) {
 		return JS_UNDEFINED;
@@ -138,7 +137,7 @@ js_htmlCollection_namedItem2(JSContext *ctx, JSValueConst this_val, const char *
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
-	xmlpp::Node::NodeSet *ns = js_htmlCollection_GetOpaque(this_val);
+	xmlpp::Node::NodeSet *ns = static_cast<xmlpp::Node::NodeSet *>(js_htmlCollection_GetOpaque(this_val));
 
 	if (!ns) {
 		return JS_UNDEFINED;
@@ -198,7 +197,7 @@ js_htmlCollection_set_items(JSContext *ctx, JSValue this_val, void *node)
 #endif
 	int counter = 0;
 
-	xmlpp::Node::NodeSet *ns = js_htmlCollection_GetOpaque(this_val);
+	xmlpp::Node::NodeSet *ns = static_cast<xmlpp::Node::NodeSet *>(js_htmlCollection_GetOpaque(this_val));
 
 	if (!ns) {
 		return;
@@ -209,7 +208,7 @@ js_htmlCollection_set_items(JSContext *ctx, JSValue this_val, void *node)
 	while (1) {
 		try {
 			element = dynamic_cast<xmlpp::Element *>(ns->at(counter));
-		} catch (std::out_of_range e) { return;}
+		} catch (std::out_of_range &e) { return;}
 
 		if (!element) {
 			return;
@@ -254,10 +253,12 @@ js_htmlCollection_finalizer(JSRuntime *rt, JSValue val)
 	map_collections.erase(node);
 }
 
+#if 0
 static JSClassDef js_htmlCollection_class = {
 	"htmlCollection",
 	js_htmlCollection_finalizer
 };
+#endif
 
 #if 0
 static JSValue
diff --git a/src/ecmascript/quickjs/element.c b/src/ecmascript/quickjs/element.c
index c1531fc9..fcae5ba7 100644
--- a/src/ecmascript/quickjs/element.c
+++ b/src/ecmascript/quickjs/element.c
@@ -1767,7 +1767,7 @@ static const JSCFunctionListEntry js_element_proto_funcs[] = {
 	JS_CFUNC_DEF("toString", 0, js_element_toString)
 };
 
-static std::map<void *, JSValueConst> map_elements;
+static std::map<const void *, JSValueConst> map_elements;
 
 static
 void js_element_finalizer(JSRuntime *rt, JSValue val)
@@ -1834,7 +1834,7 @@ js_element_init(JSContext *ctx)
 
 
 JSValue
-getElement(JSContext *ctx, void *node)
+getElement(JSContext *ctx, const void *node)
 {
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
diff --git a/src/ecmascript/quickjs/element.h b/src/ecmascript/quickjs/element.h
index 5ad3cd59..316b7464 100644
--- a/src/ecmascript/quickjs/element.h
+++ b/src/ecmascript/quickjs/element.h
@@ -3,7 +3,7 @@
 
 #include <quickjs/quickjs.h>
 
-JSValue getElement(JSContext *ctx, void *node);
+JSValue getElement(JSContext *ctx, const void *node);
 
 int js_element_init(JSContext *ctx);
 void walk_tree(struct string *buf, void *nod, bool start = true, bool toSortAttrs = false);