diff --git a/src/ecmascript/libdom/mujs/attributes.c b/src/ecmascript/libdom/mujs/attributes.c
index d08268d5..10f0d57b 100644
--- a/src/ecmascript/libdom/mujs/attributes.c
+++ b/src/ecmascript/libdom/mujs/attributes.c
@@ -31,9 +31,6 @@ mjs_attributes_set_items(js_State *J, void *node)
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
-	struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)js_getcontext(J);
-	assert(interpreter);
-
 	dom_exception err;
 	dom_namednodemap *attrs = (dom_namednodemap *)(node);
 	unsigned long idx;
diff --git a/src/ecmascript/libdom/mujs/console.c b/src/ecmascript/libdom/mujs/console.c
index 1e96e995..53c303e5 100644
--- a/src/ecmascript/libdom/mujs/console.c
+++ b/src/ecmascript/libdom/mujs/console.c
@@ -23,10 +23,6 @@ mjs_console_log_common(js_State *J, const char *str, const char *log_filename)
 #ifdef ECMASCRIPT_DEBUG
 	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
 #endif
-	struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)js_getcontext(J);
-
-	assert(interpreter);
-
 	if (log_filename && get_opt_bool("ecmascript.enable_console_log", NULL) && str)
 	{
 		FILE *f = fopen(log_filename, "a");
diff --git a/src/ecmascript/libdom/mujs/element.c b/src/ecmascript/libdom/mujs/element.c
index 36561846..d4d69107 100644
--- a/src/ecmascript/libdom/mujs/element.c
+++ b/src/ecmascript/libdom/mujs/element.c
@@ -1901,6 +1901,7 @@ mjs_element_cloneNode(js_State *J)
 	mjs_push_element(J, clone);
 }
 
+#if 0
 static bool
 isAncestor(dom_node *el, dom_node *node)
 {
@@ -1924,6 +1925,7 @@ isAncestor(dom_node *el, dom_node *node)
 
 	return false;
 }
+#endif
 
 static void
 mjs_element_closest(js_State *J)
diff --git a/src/ecmascript/libdom/mujs/mapa.cpp b/src/ecmascript/libdom/mujs/mapa.cpp
index af041190..db33c15c 100644
--- a/src/ecmascript/libdom/mujs/mapa.cpp
+++ b/src/ecmascript/libdom/mujs/mapa.cpp
@@ -335,14 +335,14 @@ set_elstyle(const char *text)
 	return (void *)css;
 }
 
-const char *
+char *
 get_elstyle(void *m)
 {
 	std::map<std::string, std::string> *css = static_cast<std::map<std::string, std::string> *>(m);
 	std::string delimiter("");
 	std::stringstream output("");
 	std::map<std::string, std::string>::iterator it;
-	const char *res = NULL;
+	char *res = NULL;
 
 	for (it = css->begin(); it != css->end(); it++) {
 		output << delimiter << it->first << ":" << it->second;
@@ -355,7 +355,7 @@ get_elstyle(void *m)
 	return res;
 }
 
-const char *
+char *
 get_css_value(const char *text, const char *param)
 {
 	void *m = set_elstyle(text);
@@ -378,7 +378,7 @@ get_css_value(const char *text, const char *param)
 	return res;
 }
 
-const char *
+char *
 set_css_value(const char *text, const char *param, const char *value)
 {
 	void *m = set_elstyle(text);
diff --git a/src/ecmascript/libdom/mujs/mapa.h b/src/ecmascript/libdom/mujs/mapa.h
index 0e2811bb..717b961c 100644
--- a/src/ecmascript/libdom/mujs/mapa.h
+++ b/src/ecmascript/libdom/mujs/mapa.h
@@ -47,10 +47,10 @@ void set_xhr_header(char *normalized_value, const char *h_name, struct mjs_xhr *
 char *get_output_headers(struct mjs_xhr *x);
 char *get_output_header(const char *header_name, struct mjs_xhr *x);
 
-const char *get_elstyle(void *m);
+char *get_elstyle(void *m);
 void *set_elstyle(const char *text);
-const char *get_css_value(const char *text, const char *param);
-const char *set_css_value(const char *text, const char *param, const char *value);
+char *get_css_value(const char *text, const char *param);
+char *set_css_value(const char *text, const char *param, const char *value);
 
 #ifdef __cplusplus
 }
diff --git a/src/ecmascript/libdom/mujs/style.c b/src/ecmascript/libdom/mujs/style.c
index 8a7446ac..741c8db2 100644
--- a/src/ecmascript/libdom/mujs/style.c
+++ b/src/ecmascript/libdom/mujs/style.c
@@ -28,7 +28,7 @@ mjs_style(js_State *J, const char *property)
 	dom_exception exc;
 	dom_node *el = (struct dom_node *)js_touserdata(J, 0, "style");
 	dom_string *style = NULL;
-	const char *res = NULL;
+	char *res = NULL;
 
 	if (!el) {
 		js_pushnull(J);
@@ -72,7 +72,7 @@ mjs_set_style(js_State *J, const char *property)
 	dom_node *el = (struct dom_node *)js_touserdata(J, 0, "style");
 	dom_string *style = NULL;
 	dom_string *stylestr = NULL;
-	const char *res = NULL;
+	char *res = NULL;
 	const char *value;
 
 	if (!el) {