diff --git a/zathura/plugin.c b/zathura/plugin.c
index cb51a21..14fdbae 100644
--- a/zathura/plugin.c
+++ b/zathura/plugin.c
@@ -52,7 +52,7 @@ static void zathura_plugin_free(zathura_plugin_t* plugin);
 static void zathura_type_plugin_mapping_free(zathura_type_plugin_mapping_t* mapping);
 
 zathura_plugin_manager_t*
-zathura_plugin_manager_new()
+zathura_plugin_manager_new(void)
 {
   zathura_plugin_manager_t* plugin_manager = g_try_malloc0(sizeof(zathura_plugin_manager_t));
   if (plugin_manager == NULL) {
diff --git a/zathura/plugin.h b/zathura/plugin.h
index 9512a0a..799159f 100644
--- a/zathura/plugin.h
+++ b/zathura/plugin.h
@@ -29,7 +29,7 @@ typedef struct zathura_plugin_version_s {
  *
  * @return A plugin manager object or NULL if an error occured
  */
-zathura_plugin_manager_t* zathura_plugin_manager_new();
+zathura_plugin_manager_t* zathura_plugin_manager_new(void);
 
 /**
  * Frees the plugin manager