diff --git a/test/plugin_ui.h b/test/plugin_ui.h
index 08394ed..63cc82a 100644
--- a/test/plugin_ui.h
+++ b/test/plugin_ui.h
@@ -178,7 +178,7 @@ static void on_window_resize (window *w, int32_t width, int32_t height) {
 }
 
 static plugin_ui *plugin_ui_create(char has_parent, void *parent, plugin_ui_callbacks *cbs) {
-	plugin_ui *instance = malloc(sizeof(plugin_ui));
+	plugin_ui *instance = (plugin_ui *) malloc(sizeof(plugin_ui));
 	if (instance == NULL)
 		return NULL;