diff --git a/sw/source/writerfilter/dmapper/StyleSheetTable.cxx b/sw/source/writerfilter/dmapper/StyleSheetTable.cxx
index 8ec83a48b5fa..5ba0c1a04802 100644
--- a/sw/source/writerfilter/dmapper/StyleSheetTable.cxx
+++ b/sw/source/writerfilter/dmapper/StyleSheetTable.cxx
@@ -2181,7 +2181,7 @@ void StyleSheetTable::applyDefaults(bool bParaProperties)
 }
 
 
-OUString StyleSheetTable::getOrCreateCharStyle( PropertyValueVector_t& rCharProperties, bool bAlwaysCreate )
+OUString StyleSheetTable::getOrCreateCharStyle( const PropertyValueVector_t& rCharProperties, bool bAlwaysCreate )
 {
     //find out if any of the styles already has the required properties then return its name
     OUString sListLabel = HasListCharStyle(rCharProperties);
diff --git a/sw/source/writerfilter/dmapper/StyleSheetTable.hxx b/sw/source/writerfilter/dmapper/StyleSheetTable.hxx
index 42bed9fe6303..a66c1d4b999b 100644
--- a/sw/source/writerfilter/dmapper/StyleSheetTable.hxx
+++ b/sw/source/writerfilter/dmapper/StyleSheetTable.hxx
@@ -116,7 +116,7 @@ public:
     OUString CloneTOCStyle(FontTablePtr const& rFontTable, StyleSheetEntryPtr const pStyle, OUString const& rName);
     void ApplyClonedTOCStyles();
 
-    OUString getOrCreateCharStyle( PropertyValueVector_t& rCharProperties, bool bAlwaysCreate );
+    OUString getOrCreateCharStyle( const PropertyValueVector_t& rCharProperties, bool bAlwaysCreate );
 
     void SetDefaultParaProps(PropertyIds eId, const css::uno::Any& rAny);
     PropertyMapPtr const & GetDefaultParaProps() const;