diff --git a/plugins/sudoers/group_plugin.c b/plugins/sudoers/group_plugin.c
index da3adc680..505868740 100644
--- a/plugins/sudoers/group_plugin.c
+++ b/plugins/sudoers/group_plugin.c
@@ -159,6 +159,7 @@ done:
 	if (group_handle != NULL) {
 	    dlclose(group_handle);
 	    group_handle = NULL;
+	    group_plugin = NULL;
 	}
     }
 
@@ -171,6 +172,7 @@ group_plugin_unload(void)
     (group_plugin->cleanup)();
     dlclose(group_handle);
     group_handle = NULL;
+    group_plugin = NULL;
 }
 
 int