1 files changed, 3 insertions, 3 deletions
diff --git a/oox/inc/drawingml/clrschemecontext.hxx b/oox/inc/drawingml/clrschemecontext.hxx
index b16f1c25a7f6..5947b3119b93 100644
--- a/oox/inc/drawingml/clrschemecontext.hxx
+++ b/oox/inc/drawingml/clrschemecontext.hxx
@@ -30,14 +30,14 @@ namespace oox { namespace drawingml {
 class clrMapContext : public oox::core::ContextHandler2
 {
 public:
-    clrMapContext( ::oox::core::ContextHandler2Helper& rParent,
+    clrMapContext( ::oox::core::ContextHandler2Helper const & rParent,
         const ::oox::AttributeList& rAttributes, ClrMap& rClrMap );
 };
 
 class clrSchemeColorContext : private Color, public ColorContext
 {
 public:
-    clrSchemeColorContext( ::oox::core::ContextHandler2Helper& rParent, ClrScheme& rClrScheme, sal_Int32 nColorToken );
+    clrSchemeColorContext( ::oox::core::ContextHandler2Helper const & rParent, ClrScheme& rClrScheme, sal_Int32 nColorToken );
     virtual ~clrSchemeColorContext() override;
 
 private:
@@ -48,7 +48,7 @@ private:
 class clrSchemeContext : public oox::core::ContextHandler2
 {
 public:
-    clrSchemeContext( ::oox::core::ContextHandler2Helper& rParent, ClrScheme& rClrScheme );
+    clrSchemeContext( ::oox::core::ContextHandler2Helper const & rParent, ClrScheme& rClrScheme );
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 
 private: