diff --git a/glib/sailfishaccesscontrol.c b/glib/sailfishaccesscontrol.c
index 18f3f9b..74854ad 100644
--- a/glib/sailfishaccesscontrol.c
+++ b/glib/sailfishaccesscontrol.c
@@ -24,6 +24,8 @@
 #include <glib.h>
 
 #define NO_GROUPS GINT_TO_POINTER(1)
+#define SAILFISH_SYSTEM_GROUP "sailfish-system"
+#define SAILFISH_SYSTEM_PREFIX "sailfish-"
 
 GHashTable *s_groups = NULL;
 
@@ -77,3 +79,26 @@ bool sailfish_access_control_hasgroup(uid_t uid, const char *group_name)
 
     return false;
 }
+
+uid_t sailfish_access_control_systemuser_uid()
+{
+    struct group *grp = getgrnam(SAILFISH_SYSTEM_GROUP);
+    struct passwd *pw;
+    int i;
+    uid_t uid = SAILFISH_UNDEFINED_UID;
+
+    // Get system user UID using sailfish-system group
+    if (grp) {
+        for (i = 0; grp->gr_mem[i]; i++) {
+            if (strncmp(grp->gr_mem[i], SAILFISH_SYSTEM_PREFIX, strlen(SAILFISH_SYSTEM_PREFIX))) {
+                pw = getpwnam(grp->gr_mem[i]);
+                if (pw) {
+                    uid = pw->pw_uid;
+                    break;
+                }
+            }
+        }
+    }
+
+    return uid;
+}
diff --git a/glib/sailfishaccesscontrol.h b/glib/sailfishaccesscontrol.h
index 1a62160..65bdbbd 100644
--- a/glib/sailfishaccesscontrol.h
+++ b/glib/sailfishaccesscontrol.h
@@ -22,12 +22,15 @@
 #include <stdbool.h>
 #include <unistd.h>
 
+#define SAILFISH_UNDEFINED_UID UINT_MAX
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 #pragma GCC visibility push(default)
 
 bool sailfish_access_control_hasgroup(uid_t uid, const char *group_name);
+uid_t sailfish_access_control_systemuser_uid();
 
 #pragma GCC visibility pop
 
diff --git a/qt/accesscontrol.cpp b/qt/accesscontrol.cpp
index 236c993..df68727 100644
--- a/qt/accesscontrol.cpp
+++ b/qt/accesscontrol.cpp
@@ -38,9 +38,20 @@ bool AccessControl::hasGroup(int uid, const QString groupName)
         case EffectiveUid:
             uid = geteuid();
             break;
+        case UndefinedUid:
+            return false;
+            break;
         default:
             Q_ASSERT_X(uid >= 0, Q_FUNC_INFO, "Uid must be either of enum type Uid or non-negative.");
             break;
     }
     return sailfish_access_control_hasgroup(uid, groupName.toLatin1().data());
 }
+
+int AccessControl::systemUserUid()
+{
+    uid_t uid = sailfish_access_control_systemuser_uid();
+    if (uid == SAILFISH_UNDEFINED_UID)
+        return Uid::UndefinedUid;
+    return uid;
+}
diff --git a/qt/accesscontrol.h b/qt/accesscontrol.h
index 3a75828..56ab4dd 100644
--- a/qt/accesscontrol.h
+++ b/qt/accesscontrol.h
@@ -32,11 +32,13 @@ class AccessControl : public QObject
 
     enum Uid : int {
         RealUid = -1,
-        EffectiveUid = -2
+        EffectiveUid = -2,
+        UndefinedUid = -INT_MAX
     };
     Q_ENUM(Uid)
 
     Q_INVOKABLE bool hasGroup(int uid, const QString groupName);
+    Q_INVOKABLE int systemUserUid();
 };
 
 }
diff --git a/rpm/sailfish-access-control-qt5.spec b/rpm/sailfish-access-control-qt5.spec
index 9b2a0c8..c029e3e 100644
--- a/rpm/sailfish-access-control-qt5.spec
+++ b/rpm/sailfish-access-control-qt5.spec
@@ -5,7 +5,7 @@ Release:    1
 License:    LGPLv2+
 URL:        https://git.sailfishos.org/mer-core/sailfish-access-control
 Source0:    %{name}-%{version}.tar.bz2
-BuildRequires: pkgconfig(sailfishaccesscontrol) = %{version}
+BuildRequires: pkgconfig(sailfishaccesscontrol) >= %{version}
 BuildRequires: pkgconfig(Qt5Core)
 BuildRequires: pkgconfig(Qt5Qml)