diff --git a/src/app/apputils.cpp b/src/app/apputils.cpp
deleted file mode 100644
index 8561647c..00000000
--- a/src/app/apputils.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-#include "apputils.h"
-#include <QStringList>
-
-QString humanReadableSize(long size) {
-  double num = size;
-  QStringList list;
-  list << "KB"
-       << "MB"
-       << "GB";
-
-  QStringListIterator i(list);
-  QString unit("bytes");
-
-  if (size < 1024) {
-    return QString().setNum(num) + " " + unit;
-  }
-
-  while (num >= 1024.0 && i.hasNext()) {
-    unit = i.next();
-    num /= 1024.0;
-  }
-
-  return QString().setNum(num, 'f', 2) + " " + unit;
-}
diff --git a/src/app/apputils.h b/src/app/apputils.h
index 454cd015..5618ff0d 100644
--- a/src/app/apputils.h
+++ b/src/app/apputils.h
@@ -1,4 +1,7 @@
 #pragma once
 #include <QString>
+#include <QLocale>
 
-QString humanReadableSize(long size);
+inline QString humanReadableSize(qint64 size) {
+  return QLocale().formattedDataSize(size, 2, QLocale::DataSizeSIFormat);
+}
diff --git a/src/resp.pro b/src/resp.pro
index 0b264115..f69e86a3 100644
--- a/src/resp.pro
+++ b/src/resp.pro
@@ -24,8 +24,7 @@ DEFINES += APP_VERSION=\\\"$$VERSION\\\"
 
 SOURCES += \
     $$PWD/main.cpp \
-    $$PWD/app/app.cpp \
-    $$PWD/app/apputils.cpp \
+    $$PWD/app/app.cpp \    
     $$PWD/app/events.cpp \
     $$PWD/app/qmlutils.cpp \
     $$PWD/app/jsonutils.cpp \
diff --git a/tests/unit_tests/main.cpp b/tests/unit_tests/main.cpp
index 2855e8d6..382da9dd 100644
--- a/tests/unit_tests/main.cpp
+++ b/tests/unit_tests/main.cpp
@@ -8,6 +8,7 @@
 #include "testcases/app/test_connectionsmanager.h"
 #include "testcases/app/test_keymodels.h"
 #include "testcases/app/test_treeoperations.h"
+#include "testcases/app/test_apputils.h"
 #include "testcases/connections-tree/test_databaseitem.h"
 #include "testcases/connections-tree/test_model.h"
 #include "testcases/connections-tree/test_serveritem.h"
@@ -34,6 +35,7 @@ int main(int argc, char *argv[]) {
                        + QTest::qExec(new TestConfigManager, argc, argv)
                        + QTest::qExec(new TestKeyModels, argc, argv)
                        + QTest::qExec(new TestTreeOperations, argc, argv)
+                       + QTest::qExec(new TestAppUtils, argc, argv)
                        ;
 
   if (allTestsResult == 0)
diff --git a/tests/unit_tests/testcases/app/app-tests.pri b/tests/unit_tests/testcases/app/app-tests.pri
index 216a1e04..df8d6a00 100644
--- a/tests/unit_tests/testcases/app/app-tests.pri
+++ b/tests/unit_tests/testcases/app/app-tests.pri
@@ -27,8 +27,7 @@ HEADERS  += \
 
 SOURCES += \
     $$files($$PWD/test_*.cpp) \
-    $$APP_SRC_DIR/events.cpp \
-    $$APP_SRC_DIR/apputils.cpp \
+    $$APP_SRC_DIR/events.cpp \    
     $$APP_SRC_DIR/jsonutils.cpp \
     $$APP_SRC_DIR/models/connectionsmanager.cpp \
     $$APP_SRC_DIR/models/configmanager.cpp \
diff --git a/tests/unit_tests/testcases/app/test_apputils.cpp b/tests/unit_tests/testcases/app/test_apputils.cpp
new file mode 100644
index 00000000..f9b75d01
--- /dev/null
+++ b/tests/unit_tests/testcases/app/test_apputils.cpp
@@ -0,0 +1,11 @@
+#include "test_apputils.h"
+
+#include "app/apputils.h"
+
+void TestAppUtils::testHumanReadableSize() {
+  long long size = 3000000000;
+
+  QString result = humanReadableSize(size);
+
+  QCOMPARE(result, "3.00 GB");
+}
diff --git a/tests/unit_tests/testcases/app/test_apputils.h b/tests/unit_tests/testcases/app/test_apputils.h
new file mode 100644
index 00000000..31ec78d1
--- /dev/null
+++ b/tests/unit_tests/testcases/app/test_apputils.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "respbasetestcase.h"
+
+class TestAppUtils : public RESPBaseTestCase
+{
+    Q_OBJECT    
+
+private slots:
+    void testHumanReadableSize();
+};
+