diff --git a/src/blackmisc/input/joystickbutton.cpp b/src/blackmisc/input/joystickbutton.cpp
index 98a3245f9..70447c4b6 100644
--- a/src/blackmisc/input/joystickbutton.cpp
+++ b/src/blackmisc/input/joystickbutton.cpp
@@ -24,6 +24,12 @@ namespace BlackMisc
             m_buttonIndex = buttonIndex;
         }
 
+        bool CJoystickButton::isValid() const
+        {
+            if (!m_deviceName.isEmpty() && m_buttonIndex >= 0)  { return true; }
+            else { return false; }
+        }
+
         void CJoystickButton::setButtonObject(CJoystickButton button)
         {
             this->m_buttonIndex = button.m_buttonIndex;
diff --git a/src/blackmisc/input/joystickbutton.h b/src/blackmisc/input/joystickbutton.h
index 8b7de74a7..0030ba338 100644
--- a/src/blackmisc/input/joystickbutton.h
+++ b/src/blackmisc/input/joystickbutton.h
@@ -61,7 +61,7 @@ namespace BlackMisc
             void setButtonIndex(int buttonIndex);
 
             //! Is valid?
-            bool isValid() const { return !m_deviceName.isEmpty() && m_buttonIndex >= 0 ? true : false; }
+            bool isValid() const;
 
             //! Set button object
             void setButtonObject(CJoystickButton button);