diff --git a/main.cpp b/main.cpp
index 4052b0c..eea0d9b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,6 +1,6 @@
 /*****************************************************************************
 * mayu Mate Are You Up
-* Copyright (C) 2018 Syping
+* Copyright (C) 2019 Syping
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/mayu.cpp b/mayu.cpp
index 0455711..210a777 100644
--- a/mayu.cpp
+++ b/mayu.cpp
@@ -1,6 +1,6 @@
 /*****************************************************************************
 * mayu Mate Are You Up
-* Copyright (C) 2018 Syping
+* Copyright (C) 2019 Syping
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -403,11 +403,17 @@ bool mayu::p_dropPrivileges()
 {
 #if _POSIX_SAVED_IDS
     p_uid = geteuid();
+    p_gid = getegid();
     int status = seteuid(getuid());
     if (status != 0) {
         QTextStream(stderr) << "Dropping of privileges has failed!" << endl;
         return false;
     }
+    status = setegid(getgid());
+    if (status != 0) {
+        QTextStream(stderr) << "Dropping of privileges has failed!" << endl;
+        return false;
+    }
     return true;
 #else
     return false;
@@ -422,6 +428,11 @@ bool mayu::p_regainPrivileges()
         QTextStream(stderr) << "Regaining of privileges has failed!" << endl;
         return false;
     }
+    status = setegid(p_gid);
+    if (status != 0) {
+        QTextStream(stderr) << "Regaining of privileges has failed!" << endl;
+        return false;
+    }
     return true;
 #else
     return false;
diff --git a/mayu.h b/mayu.h
index 2c190fa..2b09b67 100644
--- a/mayu.h
+++ b/mayu.h
@@ -1,6 +1,6 @@
 /*****************************************************************************
 * mayu Mate Are You Up
-* Copyright (C) 2018 Syping
+* Copyright (C) 2019 Syping
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -82,6 +82,7 @@ private:
     bool p_clean;
 #ifdef PRIVILEGE_DROP_REQUIRED
     uid_t p_uid;
+    gid_t p_gid;
 #endif
 };
 
diff --git a/mayu.pro b/mayu.pro
index accb72a..4d4b60c 100644
--- a/mayu.pro
+++ b/mayu.pro
@@ -1,6 +1,6 @@
 #/*****************************************************************************
 #* mayu Mate Are You Up
-#* Copyright (C) 2018 Syping
+#* Copyright (C) 2019 Syping
 #*
 #* Licensed under the Apache License, Version 2.0 (the "License");
 #* you may not use this file except in compliance with the License.