diff --git a/src/CLI2.cpp b/src/CLI2.cpp
index 1447c9e32..0b2a480ed 100644
--- a/src/CLI2.cpp
+++ b/src/CLI2.cpp
@@ -2071,18 +2071,6 @@ bool CLI2::isAttribute (const std::string& raw) const
   return true;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-bool CLI2::isOperator (const std::string& raw) const
-{
-  // Walk the list of entities for category.
-  auto c = _entities.equal_range ("operator");
-  for (auto e = c.first; e != c.second; ++e)
-    if (raw == e->second)
-      return true;
-
-  return false;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 bool CLI2::isName (const std::string& raw) const
 {
diff --git a/src/CLI2.h b/src/CLI2.h
index f22c81c86..56bb9afac 100644
--- a/src/CLI2.h
+++ b/src/CLI2.h
@@ -131,7 +131,6 @@ private:
 
   bool isUUIDList       (const std::string&) const;
   bool isAttribute      (const std::string&) const;
-  bool isOperator       (const std::string&) const;
   bool isName           (const std::string&) const;
 
   bool disqualifyInsufficientTerms (const std::vector <std::pair <std::string, Lexer::Type>>&) const;