diff --git a/libstdc++-v3/include/ext/sso_string_base.h b/libstdc++-v3/include/ext/sso_string_base.h
index 638eeba..39a62d6 100644
--- a/libstdc++-v3/include/ext/sso_string_base.h
+++ b/libstdc++-v3/include/ext/sso_string_base.h
@@ -432,7 +432,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		    // Allocate more space.
 		    __capacity = __len + 1;
 		    _CharT* __another = _M_create(__capacity, __len);
-		    _S_copy(__another, _M_data(), __len);
+		    this->_S_copy(__another, _M_data(), __len);
 		    _M_dispose();
 		    _M_data(__another);
 		    _M_capacity(__capacity);
@@ -472,7 +472,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 	// Check for out_of_range and length_error exceptions.
 	__try
-	  { _S_copy_chars(_M_data(), __beg, __end); }
+	  { this->_S_copy_chars(_M_data(), __beg, __end); }
 	__catch(...)
 	  {
 	    _M_dispose();
@@ -494,7 +494,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	}
 
       if (__n)
-	_S_assign(_M_data(), __n, __c);
+	this->_S_assign(_M_data(), __n, __c);
 
       _M_set_length_no_wipe(__n);
     }
@@ -519,7 +519,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    }
 
 	  if (__rsize)
-	    _S_copy(_M_data(), __rcs._M_data(), __rsize);
+	    this->_S_copy(_M_data(), __rcs._M_data(), __rsize);
 
 	  _M_set_length(__rsize);
 	}
@@ -541,14 +541,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	      || __res > size_type(_S_local_capacity))
 	    {
 	      _CharT* __tmp = _M_create(__res, __capacity);
-	      _S_copy(__tmp, _M_data(), _M_length() + 1);
+	      this->_S_copy(__tmp, _M_data(), _M_length() + 1);
 	      _M_dispose();
 	      _M_data(__tmp);
 	      _M_capacity(__res);
 	    }
 	  else if (!_M_is_local())
 	    {
-	      _S_copy(_M_local_data, _M_data(), _M_length() + 1);
+	      this->_S_copy(_M_local_data, _M_data(), _M_length() + 1);
 	      _M_destroy(__capacity);
 	      _M_data(_M_local_data);
 	    }
@@ -567,12 +567,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _CharT* __r = _M_create(__new_capacity, _M_capacity());
 
       if (__pos)
-	_S_copy(__r, _M_data(), __pos);
+	this->_S_copy(__r, _M_data(), __pos);
       if (__s && __len2)
-	_S_copy(__r + __pos, __s, __len2);
+	this->_S_copy(__r + __pos, __s, __len2);
       if (__how_much)
-	_S_copy(__r + __pos + __len2,
-		_M_data() + __pos + __len1, __how_much);
+	this->_S_copy(__r + __pos + __len2,
+		      _M_data() + __pos + __len1, __how_much);
       
       _M_dispose();
       _M_data(__r);
@@ -587,8 +587,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       const size_type __how_much = _M_length() - __pos - __n;
 
       if (__how_much && __n)
-	_S_move(_M_data() + __pos, _M_data() + __pos + __n,
-		__how_much);
+	this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);
 
       _M_set_length(_M_length() - __n);
     }
diff --git a/libstdc++-v3/include/ext/vstring.h b/libstdc++-v3/include/ext/vstring.h
index 90a5683..57f36a6 100644
--- a/libstdc++-v3/include/ext/vstring.h
+++ b/libstdc++-v3/include/ext/vstring.h
@@ -1374,7 +1374,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 				   && __i2 <= _M_iend());
 	  __glibcxx_requires_valid_range(__k1, __k2);
 	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
-	  return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
+	  return this->_M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
 	}
 
       // Specializations for the common case of pointer and iterator:
@@ -1929,7 +1929,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 	int __r = traits_type::compare(this->_M_data(), __str.data(), __len);
 	if (!__r)
-	  __r = _S_compare(__size, __osize);
+	  __r = this->_S_compare(__size, __osize);
 	return __r;
       }
 
diff --git a/libstdc++-v3/include/ext/vstring.tcc b/libstdc++-v3/include/ext/vstring.tcc
index e36058b..588985b 100644
--- a/libstdc++-v3/include/ext/vstring.tcc
+++ b/libstdc++-v3/include/ext/vstring.tcc
@@ -466,7 +466,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       int __r = traits_type::compare(this->_M_data() + __pos,
 				     __str.data(), __len);
       if (!__r)
-	__r = _S_compare(__n, __osize);
+	__r = this->_S_compare(__n, __osize);
       return __r;
     }
 
@@ -485,7 +485,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       int __r = traits_type::compare(this->_M_data() + __pos1,
 				     __str.data() + __pos2, __len);
       if (!__r)
-	__r = _S_compare(__n1, __n2);
+	__r = this->_S_compare(__n1, __n2);
       return __r;
     }
 
@@ -501,7 +501,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       const size_type __len = std::min(__size, __osize);
       int __r = traits_type::compare(this->_M_data(), __s, __len);
       if (!__r)
-	__r = _S_compare(__size, __osize);
+	__r = this->_S_compare(__size, __osize);
       return __r;
     }
 
@@ -518,7 +518,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       const size_type __len = std::min(__n1, __osize);
       int __r = traits_type::compare(this->_M_data() + __pos, __s, __len);
       if (!__r)
-	__r = _S_compare(__n1, __osize);
+	__r = this->_S_compare(__n1, __osize);
       return __r;
     }
 
@@ -535,7 +535,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       const size_type __len = std::min(__n1, __n2);
       int __r = traits_type::compare(this->_M_data() + __pos, __s, __len);
       if (!__r)
-	__r = _S_compare(__n1, __n2);
+	__r = this->_S_compare(__n1, __n2);
       return __r;
     }
 
