diff --git a/src/common/QskStateCombination.cpp b/src/common/QskStateCombination.cpp
deleted file mode 100644
index 07a7b481..00000000
--- a/src/common/QskStateCombination.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-/******************************************************************************
- * QSkinny - Copyright (C) 2016 Uwe Rathmann
- * This file may be used under the terms of the QSkinny License, Version 1.0
- *****************************************************************************/
-
-#include "QskStateCombination.h"
-
-static void qskRegisterStateCombination()
-{
-    qRegisterMetaType< QskStateCombination >();
-}
-
-Q_CONSTRUCTOR_FUNCTION( qskRegisterStateCombination )
-
diff --git a/src/common/QskStateCombination.h b/src/common/QskStateCombination.h
index 8393c90b..13d64e22 100644
--- a/src/common/QskStateCombination.h
+++ b/src/common/QskStateCombination.h
@@ -21,6 +21,9 @@ class QSK_EXPORT QskStateCombination
     constexpr QskStateCombination( QskAspect::States = QskAspect::States() ) noexcept;
     constexpr QskStateCombination( Type, QskAspect::States = QskAspect::States() ) noexcept;
 
+    constexpr bool operator==( QskStateCombination ) const noexcept;
+    constexpr bool operator!=( QskStateCombination ) const noexcept;
+
     constexpr bool isNull() const noexcept;
 
     void setType( Type ) noexcept;
@@ -36,7 +39,6 @@ class QSK_EXPORT QskStateCombination
 };
 
 Q_DECLARE_TYPEINFO( QskStateCombination, Q_MOVABLE_TYPE );
-Q_DECLARE_METATYPE( QskStateCombination )
 
 constexpr inline QskStateCombination::QskStateCombination(
         QskAspect::State state ) noexcept
@@ -90,4 +92,14 @@ constexpr inline QskAspect::States QskStateCombination::states() const noexcept
     return m_states;
 }
 
+constexpr bool QskStateCombination::operator==( QskStateCombination other ) const noexcept
+{
+    return ( m_type == other.m_type ) && ( m_states == other.m_states );
+}
+
+constexpr bool QskStateCombination::operator!=( QskStateCombination other ) const noexcept
+{
+    return !( *this == other );
+}
+
 #endif
diff --git a/src/src.pro b/src/src.pro
index a25be7da..0c00a0ec 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -63,7 +63,6 @@ SOURCES += \
     common/QskScaleTickmarks.cpp \
     common/QskShadowMetrics.cpp \
     common/QskSizePolicy.cpp \
-    common/QskStateCombination.cpp \
     common/QskTextColors.cpp \
     common/QskTextOptions.cpp