diff --git a/include/internal/catch_tags.hpp b/include/internal/catch_tags.hpp
index d6060022..591ab5ad 100644
--- a/include/internal/catch_tags.hpp
+++ b/include/internal/catch_tags.hpp
@@ -74,6 +74,8 @@ namespace Catch {
             m_remainder += c;
         }
 
+        TagExtracter& operator=(const TagExtracter&);
+        
         std::set<std::string>& m_tags;
         std::string m_remainder;
     };
@@ -177,6 +179,8 @@ namespace Catch {
                 m_exp.m_tagSets.push_back( m_currentTagSet );
         }
 
+        TagExpressionParser& operator=(const TagExpressionParser&);
+
         bool m_isNegated;
         TagSet m_currentTagSet;
         TagExpression& m_exp;