diff --git a/src/widgets/widgets/qwidgetlinecontrol.cpp b/src/widgets/widgets/qwidgetlinecontrol.cpp
index 3f1c1ce629..80791cae83 100644
--- a/src/widgets/widgets/qwidgetlinecontrol.cpp
+++ b/src/widgets/widgets/qwidgetlinecontrol.cpp
@@ -963,8 +963,7 @@ void QWidgetLineControl::parseInputMask(const QString &maskFields)
     int delimiter = maskFields.indexOf(QLatin1Char(';'));
     if (maskFields.isEmpty() || delimiter == 0) {
         if (m_maskData) {
-            delete [] m_maskData;
-            m_maskData = nullptr;
+            m_maskData.reset();
             m_maxLength = 32767;
             internalSetText(QString(), -1, false);
         }
@@ -1002,8 +1001,7 @@ void QWidgetLineControl::parseInputMask(const QString &maskFields)
             m_maxLength++;
     }
 
-    delete [] m_maskData;
-    m_maskData = new MaskInputData[m_maxLength];
+    m_maskData = std::make_unique<MaskInputData[]>(m_maxLength);
 
     MaskInputData::Casemode m = MaskInputData::NoCaseMode;
     bool s;
diff --git a/src/widgets/widgets/qwidgetlinecontrol_p.h b/src/widgets/widgets/qwidgetlinecontrol_p.h
index 43ce9ff7e4..f906165c20 100644
--- a/src/widgets/widgets/qwidgetlinecontrol_p.h
+++ b/src/widgets/widgets/qwidgetlinecontrol_p.h
@@ -70,6 +70,7 @@
 #include "qplatformdefs.h"
 
 #include <vector>
+#include <memory>
 
 #ifdef DrawText
 #  undef DrawText
@@ -111,8 +112,6 @@ public:
         // to zero it out
         if (m_echoMode != QLineEdit::Normal)
             m_text.fill(u'\0');
-
-        delete [] m_maskData;
     }
 
     void setAccessibleObject(QObject *object)
@@ -465,7 +464,7 @@ private:
     };
     QString m_inputMask;
     QChar m_blank;
-    MaskInputData *m_maskData;
+    std::unique_ptr<MaskInputData[]> m_maskData;
 
     // undo/redo handling
     enum CommandType { Separator, Insert, Remove, Delete, RemoveSelection, DeleteSelection, SetSelection };