diff --git a/apps/src/su.c b/apps/src/su.c
index 0c11c520..804fb6a3 100644
--- a/apps/src/su.c
+++ b/apps/src/su.c
@@ -26,6 +26,12 @@ int main(int argc, char** argv)
         return EXIT_FAILURE;
     }
 
+    if (setgid(atoi(argv[1])) < 0)
+    {
+        perror("setgid");
+        return EXIT_FAILURE;
+    }
+
     if (argc == 2) run_program(default_argv);
     else
         run_program(argv + 2);
diff --git a/kernel/src/thread/Task.cpp b/kernel/src/thread/Task.cpp
index c01ec34b..89da8788 100644
--- a/kernel/src/thread/Task.cpp
+++ b/kernel/src/thread/Task.cpp
@@ -129,5 +129,5 @@ Descriptor* Task::descriptor_from_fd(int fd, int& error)
 
 bool Task::is_superuser()
 {
-    return euid == 0;
+    return euid == 0 || egid == 0;
 }
\ No newline at end of file