diff --git a/include/etl/private/bitset_new.h b/include/etl/private/bitset_new.h
index 841836a6..7d2b2679 100644
--- a/include/etl/private/bitset_new.h
+++ b/include/etl/private/bitset_new.h
@@ -559,14 +559,6 @@ namespace etl
       *pbuffer = (~*pbuffer) & top_mask;
     }
 
-    //*************************************************************************
-    /// Flip some of the bits.
-    //*************************************************************************
-    // static ETL_CONSTEXPR14 void flip_bits(pointer pbuffer, element_type mask = etl::integral_limits<element_type>::max) ETL_NOEXCEPT
-    //{
-    //  *pbuffer ^= mask;
-    //}
-
     //*************************************************************************
     /// Flip the bit at the position.
     //*************************************************************************