diff --git a/src/Thesaurus.cpp b/src/Thesaurus.cpp
index e7bee50aa4..7fd57d20c1 100644
--- a/src/Thesaurus.cpp
+++ b/src/Thesaurus.cpp
@@ -110,7 +110,7 @@ Thesaurus::Meanings Thesaurus::lookup(docstring const & t, docstring const &)
 bool Thesaurus::thesaurusAvailable(docstring const & lang) const
 {
 	// we support English only
-	return (prefixIs(lang, "en_"));
+	return prefixIs(lang, "en_");
 }
 
 #endif // HAVE_LIBAIKSAURUS
@@ -266,15 +266,6 @@ Thesaurus::Meanings Thesaurus::lookup(docstring const & t, docstring const & lan
 
 #else
 
-Thesaurus::Thesaurus()
-{
-}
-
-
-Thesaurus::~Thesaurus()
-{
-}
-
 
 Thesaurus::Meanings Thesaurus::lookup(docstring const &, docstring const &)
 {