diff --git a/include/algorithm b/include/algorithm
index 03b872a..442e100 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -1692,6 +1692,8 @@
     return __i.base();
 }
 
+#if _LIBCPP_DEBUG_LEVEL < 2
+
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
@@ -1704,6 +1706,8 @@
     return __i.base();
 }
 
+#endif  // _LIBCPP_DEBUG_LEVEL < 2
+
 template <class _InputIterator, class _OutputIterator>
 inline _LIBCPP_INLINE_VISIBILITY
 _OutputIterator