diff --git a/src/plugins/platforms/qnx/qqnxinputcontext_imf.cpp b/src/plugins/platforms/qnx/qqnxinputcontext_imf.cpp
index 34bf401274..1154cc4ee6 100644
--- a/src/plugins/platforms/qnx/qqnxinputcontext_imf.cpp
+++ b/src/plugins/platforms/qnx/qqnxinputcontext_imf.cpp
@@ -43,9 +43,6 @@
 #include "qqnxeventthread.h"
 #include "qqnxabstractvirtualkeyboard.h"
 
-#include <QtWidgets/QAbstractSpinBox>
-#include <QtWidgets/QAction>
-
 #include <QtGui/QGuiApplication>
 #include <QtGui/QInputMethodEvent>
 #include <QtGui/QTextCharFormat>
@@ -1562,7 +1559,7 @@ void QQnxInputContext::setFocusObject(QObject *object)
         if (m_inputPanelVisible)
             hideInputPanel();
     } else {
-        if (qobject_cast<QAbstractSpinBox*>(object))
+        if (object->inherits("QAbstractSpinBox"))
             m_virtualKeyboard.setKeyboardMode(QQnxAbstractVirtualKeyboard::Phone);
         else
             m_virtualKeyboard.setKeyboardMode(QQnxAbstractVirtualKeyboard::Default);
diff --git a/src/plugins/platforms/qnx/qqnxinputcontext_noimf.cpp b/src/plugins/platforms/qnx/qqnxinputcontext_noimf.cpp
index 28a727d7b6..24384a683b 100644
--- a/src/plugins/platforms/qnx/qqnxinputcontext_noimf.cpp
+++ b/src/plugins/platforms/qnx/qqnxinputcontext_noimf.cpp
@@ -44,7 +44,6 @@
 
 #include <QtCore/QDebug>
 #include <QtGui/QGuiApplication>
-#include <QtWidgets/QAbstractSpinBox>
 
 #ifdef QQNXINPUTCONTEXT_DEBUG
 #define qInputContextDebug qDebug
@@ -164,7 +163,7 @@ void QQnxInputContext::setFocusObject(QObject *object)
         if (m_inputPanelVisible)
             hideInputPanel();
     } else {
-        if (qobject_cast<QAbstractSpinBox*>(object))
+        if (object->inherits("QAbstractSpinBox"))
             m_virtualKeyboard.setKeyboardMode(QQnxAbstractVirtualKeyboard::Phone);
         else
             m_virtualKeyboard.setKeyboardMode(QQnxAbstractVirtualKeyboard::Default);