diff --git a/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.hxx b/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.hxx
index cc64db4..d2602c1 100644
--- a/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.hxx
+++ b/sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.hxx
@@ -114,7 +114,7 @@ namespace pdfi
 
         bool operator==(const FontAttributes& rFont) const
         {
-            return familyName.cmp(
+            return const_cast<GooString*>(&familyName)->cmp(
                 const_cast<GooString*>(&rFont.familyName))==0 &&
                 isEmbedded == rFont.isEmbedded &&
                 isBold == rFont.isBold &&