diff --git a/libstdc++-v3/config/os/aix/bits/ctype_noninline.h b/libstdc++-v3/config/os/aix/bits/ctype_noninline.h
index f0bb31b121d..7cf919afca9 100644
--- a/libstdc++-v3/config/os/aix/bits/ctype_noninline.h
+++ b/libstdc++-v3/config/os/aix/bits/ctype_noninline.h
@@ -37,17 +37,17 @@
   ctype<char>::classic_table() throw()
   { return 0; }
 
-  ctype<char>::ctype(__c_locale, const mask* __table, bool __del, 
-		     size_t __refs) 
-  : __ctype_abstract_base<char>(__refs), _M_del(__table != 0 && __del), 
-  _M_toupper(NULL), _M_tolower(NULL), 
-  _M_table(__table ? __table : classic_table()) 
+  ctype<char>::ctype(__c_locale, const mask* __table, bool __del,
+		     size_t __refs)
+  : __ctype_abstract_base<char>(__refs), _M_del(__table != 0 && __del),
+  _M_toupper(NULL), _M_tolower(NULL),
+  _M_table(__table ? __table : classic_table())
   { }
 
-  ctype<char>::ctype(const mask* __table, bool __del, size_t __refs) 
-  : __ctype_abstract_base<char>(__refs), _M_del(__table != 0 && __del), 
-  _M_toupper(NULL), _M_tolower(NULL), 
-  _M_table(__table ? __table : classic_table()) 
+  ctype<char>::ctype(const mask* __table, bool __del, size_t __refs)
+  : __ctype_abstract_base<char>(__refs), _M_del(__table != 0 && __del),
+  _M_toupper(NULL), _M_tolower(NULL),
+  _M_table(__table ? __table : classic_table())
   { }
 
   char
@@ -59,7 +59,7 @@
   {
     while (__low < __high)
       {
-	*__low = this->do_toupper(*__low);
+	*__low = ::toupper((int) *__low);
 	++__low;
       }
     return __high;
@@ -69,13 +69,14 @@
   ctype<char>::do_tolower(char __c) const
   { return ::tolower((int) __c); }
 
-  const char* 
+  const char*
   ctype<char>::do_tolower(char* __low, const char* __high) const
   {
     while (__low < __high)
       {
-	*__low = this->do_tolower(*__low);
+	*__low = ::tolower((int) *__low);
 	++__low;
       }
     return __high;
   }
+