diff --git a/src/CLI2.cpp b/src/CLI2.cpp
index b64d7a828..97346db27 100644
--- a/src/CLI2.cpp
+++ b/src/CLI2.cpp
@@ -2011,22 +2011,6 @@ bool CLI2::isTerminator (const std::string& raw) const
   return raw == "--";
 }
 
-////////////////////////////////////////////////////////////////////////////////
-// Valid tag
-//   - Length > 1
-//   - Starts with +/-
-//   - The rest matches ::isName
-bool CLI2::isTag (const std::string& raw) const
-{
-  if (raw.size () >= 2                 &&
-      (raw[0] == '+' || raw[0] == '-') &&
-      isName (raw.substr (1))          &&
-      raw.find (' ') == std::string::npos)
-    return true;
-
-  return false;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 bool CLI2::isUUIDList (const std::string& raw) const
 {
@@ -2187,7 +2171,7 @@ bool CLI2::disqualifyOnlyParenOps (
         ++opParenCount;
     }
 
-    else if (isTag          (lexeme.first) ||
+    else if (isTag          (lexeme.first) || // obsolete
              isUUIDList     (lexeme.first) ||
              isUUID         (lexeme.first) || // obsolete
              isIDSequence   (lexeme.first) || // obsolete
diff --git a/src/CLI2.h b/src/CLI2.h
index 1be5187aa..78067d003 100644
--- a/src/CLI2.h
+++ b/src/CLI2.h
@@ -130,7 +130,6 @@ private:
   void decomposeModSubstitutions ();
 
   bool isTerminator     (const std::string&) const;
-  bool isTag            (const std::string&) const;
   bool isUUIDList       (const std::string&) const;
   bool isPattern        (const std::string&) const;
   bool isSubstitution   (const std::string&) const;