diff --git a/src/plugins/api.c b/src/plugins/api.c
index a3740f2f..e81467a9 100644
--- a/src/plugins/api.c
+++ b/src/plugins/api.c
@@ -239,12 +239,16 @@ api_win_exists(const char *tag)
 }
 
 void
-api_win_create(const char *tag, void *callback,
+api_win_create(
+    const char *tag,
+    void *callback,
+    void(*destroy)(void *callback),
     void(*callback_func)(PluginWindowCallback *window_callback, const char *tag, const char * const line))
 {
     PluginWindowCallback *window = malloc(sizeof(PluginWindowCallback));
     window->callback = callback;
     window->callback_func = callback_func;
+    window->destroy = destroy;
     callbacks_add_window_handler(tag, window);
     wins_new_plugin(tag);
 
diff --git a/src/plugins/api.h b/src/plugins/api.h
index b56be781..6494097e 100644
--- a/src/plugins/api.h
+++ b/src/plugins/api.h
@@ -61,7 +61,10 @@ void api_log_warning(const char *message);
 void api_log_error(const char *message);
 
 int api_win_exists(const char *tag);
-void api_win_create(const char *tag, void *callback,
+void api_win_create(
+    const char *tag,
+    void *callback,
+    void(*destroy)(void *callback),
     void(*callback_func)(PluginWindowCallback *window_callback, char *tag, char *line));
 int api_win_focus(const char *tag);
 int api_win_show(const char *tag, const char *line);
diff --git a/src/plugins/c_api.c b/src/plugins/c_api.c
index d8619c49..f2cce6a6 100644
--- a/src/plugins/c_api.c
+++ b/src/plugins/c_api.c
@@ -167,7 +167,7 @@ c_api_win_create(char *tag, void(*callback)(char *tag, char *line))
 {
     WindowWrapper *wrapper = malloc(sizeof(WindowWrapper));
     wrapper->func = callback;
-    api_win_create(tag, wrapper, c_window_callback);
+    api_win_create(tag, wrapper, free, c_window_callback);
 }
 
 static int
diff --git a/src/plugins/callbacks.c b/src/plugins/callbacks.c
index a3cbfc1d..6f796259 100644
--- a/src/plugins/callbacks.c
+++ b/src/plugins/callbacks.c
@@ -46,6 +46,27 @@ static GSList *p_commands = NULL;
 static GSList *p_timed_functions = NULL;
 static GHashTable *p_window_callbacks = NULL;
 
+static void
+_free_window_callback(PluginWindowCallback *window_callback)
+{
+    if (window_callback->destroy) {
+        window_callback->destroy(window_callback->callback);
+    }
+    free(window_callback);
+}
+
+void
+callbacks_init(void)
+{
+    p_window_callbacks = g_hash_table_new_full(g_str_hash, g_str_equal, free, (GDestroyNotify)_free_window_callback);
+}
+
+void
+callbacks_close(void)
+{
+    g_hash_table_destroy(p_window_callbacks);
+}
+
 void
 callbacks_add_command(PluginCommand *command)
 {
@@ -64,10 +85,6 @@ callbacks_add_timed(PluginTimedFunction *timed_function)
 void
 callbacks_add_window_handler(const char *tag, PluginWindowCallback *window_callback)
 {
-    if (p_window_callbacks == NULL) {
-        p_window_callbacks = g_hash_table_new(g_str_hash, g_str_equal);
-    }
-
     g_hash_table_insert(p_window_callbacks, strdup(tag), window_callback);
 }
 
diff --git a/src/plugins/callbacks.h b/src/plugins/callbacks.h
index 09dc0375..dc6b78bb 100644
--- a/src/plugins/callbacks.h
+++ b/src/plugins/callbacks.h
@@ -57,9 +57,13 @@ typedef struct p_timed_function {
 
 typedef struct p_window_input_callback {
     void *callback;
+    void (*destroy)(void *callback);
     void (*callback_func)(struct p_window_input_callback *window_callback, const char *tag, const char * const line);
 } PluginWindowCallback;
 
+void callbacks_init(void);
+void callbacks_close(void);
+
 void callbacks_add_command(PluginCommand *command);
 void callbacks_add_timed(PluginTimedFunction *timed_function);
 void callbacks_add_window_handler(const char *tag, PluginWindowCallback *window_callback);
diff --git a/src/plugins/plugins.c b/src/plugins/plugins.c
index 20293c88..c1c7df3a 100644
--- a/src/plugins/plugins.c
+++ b/src/plugins/plugins.c
@@ -57,6 +57,7 @@ void
 plugins_init(void)
 {
     plugins = NULL;
+    callbacks_init();
     autocompleters_init();
     plugin_themes_init();
 
@@ -404,6 +405,7 @@ plugins_shutdown(void)
 
     autocompleters_destroy();
     plugin_themes_close();
+    callbacks_close();
 }
 
 gchar *