diff --git a/src/tests/dummy_functions.cpp b/src/tests/dummy_functions.cpp
index 2698351602..190a44f645 100644
--- a/src/tests/dummy_functions.cpp
+++ b/src/tests/dummy_functions.cpp
@@ -53,8 +53,6 @@ string alignmentToCSS(LyXAlignment)
 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