diff --git a/src/base/utils/string.cpp b/src/base/utils/string.cpp
index d01799fe0..ccd35940c 100644
--- a/src/base/utils/string.cpp
+++ b/src/base/utils/string.cpp
@@ -27,24 +27,31 @@
  * exception statement from your version.
  */
 
+#include "string.h"
+
+#include <cmath>
+
 #include <QByteArray>
-#include <QString>
+#include <QtGlobal>
 #include <QLocale>
-#include <cmath>
-#include "string.h"
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
+#include <QCollator>
+#endif
 
-QString Utils::String::fromStdString(const std::string &str)
+class NaturalCompare
 {
-    return QString::fromUtf8(str.c_str());
-}
+public:
+    NaturalCompare();
+    bool operator()(const QString &left, const QString &right);
+    bool lessThan(const QString &left, const QString &right);
 
-std::string Utils::String::toStdString(const QString &str)
-{
-    QByteArray utf8 = str.toUtf8();
-    return std::string(utf8.constData(), utf8.length());
-}
+private:
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
+    QCollator m_collator;
+#endif
+};
 
-Utils::String::NaturalCompare::NaturalCompare()
+NaturalCompare::NaturalCompare()
 {
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
 #if defined(Q_OS_WIN)
@@ -57,7 +64,7 @@ Utils::String::NaturalCompare::NaturalCompare()
 #endif
 }
 
-bool Utils::String::NaturalCompare::operator()(const QString &left, const QString &right)
+bool NaturalCompare::operator()(const QString &left, const QString &right)
 {
     // case-insensitive comparison
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
@@ -72,7 +79,7 @@ bool Utils::String::NaturalCompare::operator()(const QString &left, const QStrin
 #endif
 }
 
-bool Utils::String::NaturalCompare::lessThan(const QString &left, const QString &right)
+bool NaturalCompare::lessThan(const QString &left, const QString &right)
 {
     // Return value `false` indicates `right` should go before `left`, otherwise, after
     // case-insensitive comparison
@@ -123,6 +130,17 @@ bool Utils::String::NaturalCompare::lessThan(const QString &left, const QString
     return false;
 }
 
+QString Utils::String::fromStdString(const std::string &str)
+{
+    return QString::fromUtf8(str.c_str());
+}
+
+std::string Utils::String::toStdString(const QString &str)
+{
+    QByteArray utf8 = str.toUtf8();
+    return std::string(utf8.constData(), utf8.length());
+}
+
 bool Utils::String::naturalCompare(const QString &left, const QString &right)
 {
     // provide a single `NaturalCompare` instance for easy use
diff --git a/src/base/utils/string.h b/src/base/utils/string.h
index e379beadd..9a3c66843 100644
--- a/src/base/utils/string.h
+++ b/src/base/utils/string.h
@@ -31,13 +31,9 @@
 #define UTILS_STRING_H
 
 #include <string>
-#include <QtGlobal>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
-#include <QCollator>
-#endif
 
-class QString;
 class QByteArray;
+class QString;
 
 namespace Utils
 {
@@ -51,18 +47,6 @@ namespace Utils
         // Taken from https://crackstation.net/hashing-security.htm
         bool slowEquals(const QByteArray &a, const QByteArray &b);
 
-        class NaturalCompare
-        {
-        public:
-            NaturalCompare();
-            bool operator()(const QString &left, const QString &right);
-            bool lessThan(const QString &left, const QString &right);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 2, 0))
-        private:
-            QCollator m_collator;
-#endif
-        };
-
         bool naturalCompare(const QString &left, const QString &right);
     }
 }