diff --git a/include/internal/catch_matchers.hpp b/include/internal/catch_matchers.hpp
index d6118f89..de7d64c7 100644
--- a/include/internal/catch_matchers.hpp
+++ b/include/internal/catch_matchers.hpp
@@ -29,8 +29,8 @@ namespace Matchers {
         protected:
             virtual std::string describe() const = 0;
             mutable std::string m_cachedToString;
-		private:
-			MatcherUntypedBase& operator = (MatcherUntypedBase const&);
+        private:
+            MatcherUntypedBase& operator = ( MatcherUntypedBase const& );
         };
 
         template<typename ObjectT, typename ComparatorT = ObjectT>