diff --git a/src/tex2lyx/dummy_impl.cpp b/src/tex2lyx/dummy_impl.cpp
index 30eb847a92..17e97ed1b8 100644
--- a/src/tex2lyx/dummy_impl.cpp
+++ b/src/tex2lyx/dummy_impl.cpp
@@ -99,8 +99,6 @@ void lyx_exit(int)
 namespace xml {
 docstring StartTag::writeTag() const { return docstring(); }
 docstring StartTag::writeEndTag() const { return docstring(); }
-bool StartTag::operator==(FontTag const & rhs) const { return rhs == *this; }
-bool FontTag::operator==(StartTag const & tag) const { FontTag const * const ftag = tag.asFontTag(); if (!ftag) return false; return (font_type_ == ftag->font_type_); }
 }
 
 } // namespace lyx