diff --git a/beast/http/rfc2616.h b/beast/http/rfc2616.h
index fc697b8050..e446542c79 100644
--- a/beast/http/rfc2616.h
+++ b/beast/http/rfc2616.h
@@ -20,11 +20,12 @@
 #ifndef BEAST_HTTP_RFC2616_H_INCLUDED
 #define BEAST_HTTP_RFC2616_H_INCLUDED
 
+#include <boost/regex.hpp>
 #include <algorithm>
 #include <string>
+#include <iterator>
 #include <utility>
 #include <vector>
-#include <boost/regex.hpp>
 
 namespace beast {
 
@@ -130,8 +131,8 @@ trim (String const& s)
 {
     using std::begin;
     using std::end;
-    auto first (begin(s));
-    auto last (end(s));
+    auto first = begin(s);
+    auto last = end(s);
     std::tie (first, last) = trim (first, last);
     return { first, last };
 }
diff --git a/beast/module/core/text/LexicalCast.h b/beast/module/core/text/LexicalCast.h
index 52b122001a..f0d55ec89b 100644
--- a/beast/module/core/text/LexicalCast.h
+++ b/beast/module/core/text/LexicalCast.h
@@ -21,15 +21,16 @@
 #define BEAST_LEXICALCAST_H_INCLUDED
 
 #include <beast/Config.h>
-#include <beast/cxx14/type_traits.h> // <type_traits>
 #include <algorithm>
 #include <cerrno>
 #include <cstdlib>
+#include <iostream>
+#include <iterator>
 #include <limits>
 #include <string>
-#include <utility>
+#include <beast/cxx14/type_traits.h> // <type_traits>
 #include <typeinfo>
-#include <iostream>
+#include <utility>
 
 namespace beast {
 
@@ -169,14 +170,14 @@ struct LexicalCast <Out, std::string>
     std::enable_if_t <std::is_unsigned <Integral>::value, bool>
     operator () (Integral& out, std::string const& in) const
     {
-        return parseUnsigned (out, std::begin(in), std::end(in));
+        return parseUnsigned (out, in.begin(), in.end());
     }
 
     template <class Integral = Out>
     std::enable_if_t <std::is_signed <Integral>::value, bool>
     operator () (Integral& out, std::string const& in) const
     {
-        return parseSigned (out, std::begin(in), std::end(in));
+        return parseSigned (out, in.begin(), in.end());
     }
 
     bool
diff --git a/beast/utility/ci_char_traits.h b/beast/utility/ci_char_traits.h
index 406302369e..056e08c9b8 100644
--- a/beast/utility/ci_char_traits.h
+++ b/beast/utility/ci_char_traits.h
@@ -23,6 +23,7 @@
 #include <beast/cxx14/algorithm.h> // <algorithm>
 #include <beast/cxx14/type_traits.h> // <type_traits>
 #include <cctype>
+#include <iterator>
 #include <locale>
 #include <string>
 
@@ -37,9 +38,11 @@ struct ci_less
     bool
     operator() (String const& lhs, String const& rhs) const
     {
-        typedef typename String::value_type char_type;
-        return std::lexicographical_compare (std::begin(lhs), std::end(lhs),
-            std::begin(rhs), std::end(rhs),
+        using std::begin;
+        using std::end;
+        using char_type = typename String::value_type;
+        return std::lexicographical_compare (
+            begin(lhs), end(lhs), begin(rhs), end(rhs),
             [] (char_type lhs, char_type rhs)
             {
                 return std::tolower(lhs) < std::tolower(rhs);
@@ -54,7 +57,9 @@ std::enable_if_t<std::is_same<typename Lhs::value_type, char>::value &&
     std::is_same<typename Lhs::value_type, char>::value, bool>
 ci_equal(Lhs const& lhs, Rhs const& rhs)
 {
-    return std::equal (lhs.begin(), lhs.end(), rhs.begin(), rhs.end(),
+    using std::begin;
+    using std::end;
+    return std::equal (begin(lhs), end(lhs), begin(rhs), end(rhs),
         [] (char lhs, char rhs)
         {
             return std::tolower(lhs) == std::tolower(rhs);