diff --git a/src/core/network-proxy-http.c b/src/core/network-proxy-http.c
index 623b3203..61d49208 100644
--- a/src/core/network-proxy-http.c
+++ b/src/core/network-proxy-http.c
@@ -31,7 +31,7 @@ static void network_proxy_http_destroy(struct network_proxy *proxy)
 {
 	struct _network_proxy_http *self = container_of(proxy, struct _network_proxy_http, proxy);
 
-	g_free((void *)self->password);
+	g_free(self->password);
 	_network_proxy_destroy(proxy);
 
 	g_free(self);
diff --git a/src/core/network-proxy-http.h b/src/core/network-proxy-http.h
index 04bfdc43..1f63d5e3 100644
--- a/src/core/network-proxy-http.h
+++ b/src/core/network-proxy-http.h
@@ -5,7 +5,7 @@
 
 struct _network_proxy_http {
 	struct network_proxy proxy;
-	const char *password;
+	char *password;
 };
 
 struct network_proxy *_network_proxy_http_create(void);
diff --git a/src/core/network-proxy-priv.h b/src/core/network-proxy-priv.h
index 5f632abb..76d40f27 100644
--- a/src/core/network-proxy-priv.h
+++ b/src/core/network-proxy-priv.h
@@ -28,7 +28,7 @@ inline static void _network_proxy_clone(struct network_proxy *dst, const struct
 
 inline static void _network_proxy_destroy(struct network_proxy *proxy)
 {
-	g_free((void *)proxy->host);
+	g_free(proxy->host);
 }
 
 
diff --git a/src/core/network-proxy-simple.c b/src/core/network-proxy-simple.c
index e9f9e44c..289bb6ba 100644
--- a/src/core/network-proxy-simple.c
+++ b/src/core/network-proxy-simple.c
@@ -26,9 +26,9 @@ static void network_proxy_simple_destroy(struct network_proxy *proxy)
 {
 	struct _network_proxy_simple *self = container_of(proxy, struct _network_proxy_simple, proxy);
 
-	g_free((void *)self->password);
-	g_free((void *)self->string_after);
-	g_free((void *)self->string);
+	g_free(self->password);
+	g_free(self->string_after);
+	g_free(self->string);
 
 	_network_proxy_destroy(proxy);
 
diff --git a/src/core/network-proxy-simple.h b/src/core/network-proxy-simple.h
index e55c3925..6c3c8281 100644
--- a/src/core/network-proxy-simple.h
+++ b/src/core/network-proxy-simple.h
@@ -6,9 +6,9 @@
 struct _network_proxy_simple {
 	struct network_proxy proxy;
 
-	const char *string_after;
-	const char *string;
-	const char *password;
+	char *string_after;
+	char *string;
+	char *password;
 };
 
 struct network_proxy *_network_proxy_simple_create(void);
diff --git a/src/core/network-proxy-socks5.c b/src/core/network-proxy-socks5.c
index 8f8fb308..8c4eeaf7 100644
--- a/src/core/network-proxy-socks5.c
+++ b/src/core/network-proxy-socks5.c
@@ -67,8 +67,8 @@ static void network_proxy_socks5_destroy(struct network_proxy *proxy)
 {
 	struct _network_proxy_socks5 *self = container_of(proxy, struct _network_proxy_socks5, proxy);
 
-	g_free((void *)self->password);
-	g_free((void *)self->username);
+	g_free(self->password);
+	g_free(self->username);
 	_network_proxy_destroy(proxy);
 	g_free(self);
 }
diff --git a/src/core/network-proxy-socks5.h b/src/core/network-proxy-socks5.h
index 8dff6ed1..058edaf5 100644
--- a/src/core/network-proxy-socks5.h
+++ b/src/core/network-proxy-socks5.h
@@ -6,8 +6,8 @@
 struct _network_proxy_socks5 {
 	struct network_proxy proxy;
 
-	const char *username;
-	const char *password;
+	char *username;
+	char *password;
 };
 
 struct network_proxy *_network_proxy_socks5_create(void);
diff --git a/src/core/network-proxy.h b/src/core/network-proxy.h
index c5ec02a2..edd1a655 100644
--- a/src/core/network-proxy.h
+++ b/src/core/network-proxy.h
@@ -50,7 +50,7 @@ struct network_proxy {
 				  const struct network_proxy_send_string_info *);
 
 	/* hostname of proxy host */
-	const char *host;
+	char *host;
 
 	/* portnumber of proxy */
 	int port;