diff --git a/libstdc++-v3/include/bits/istream.tcc b/libstdc++-v3/include/bits/istream.tcc
index 733a8359902..334a91755aa 100644
--- a/libstdc++-v3/include/bits/istream.tcc
+++ b/libstdc++-v3/include/bits/istream.tcc
@@ -102,7 +102,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    ios_base::iostate __err = ios_base::goodbit;
 	    __try
 	      {
+#ifndef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
 		const __num_get_type& __ng = __check_facet(this->_M_num_get);
+#else
+		const __num_get_type& __ng
+		  = use_facet<__num_get_type>(this->_M_ios_locale);
+#endif
 		__ng.get(*this, 0, *this, __err, __v);
 	      }
 	    __catch(__cxxabiv1::__forced_unwind&)
@@ -132,7 +137,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  __try
 	    {
 	      long __l;
+#ifndef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
 	      const __num_get_type& __ng = __check_facet(this->_M_num_get);
+#else
+	      const __num_get_type& __ng
+		= use_facet<__num_get_type>(this->_M_ios_locale);
+#endif
 	      __ng.get(*this, 0, *this, __err, __l);
 
 	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
@@ -177,7 +187,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  __try
 	    {
 	      long __l;
+#ifndef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
 	      const __num_get_type& __ng = __check_facet(this->_M_num_get);
+#else
+	      const __num_get_type& __ng
+		= use_facet<__num_get_type>(this->_M_ios_locale);
+#endif
 	      __ng.get(*this, 0, *this, __err, __l);
 
 	      // _GLIBCXX_RESOLVE_LIB_DEFECTS
diff --git a/libstdc++-v3/include/bits/ostream.tcc b/libstdc++-v3/include/bits/ostream.tcc
index e20012d2dc6..bb8584276f5 100644
--- a/libstdc++-v3/include/bits/ostream.tcc
+++ b/libstdc++-v3/include/bits/ostream.tcc
@@ -69,7 +69,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    ios_base::iostate __err = ios_base::goodbit;
 	    __try
 	      {
+#ifndef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT
 		const __num_put_type& __np = __check_facet(this->_M_num_put);
+#else
+		const __num_put_type& __np
+		  = use_facet<__num_put_type>(this->_M_ios_locale);
+#endif
 		if (__np.put(*this, *this, this->fill(), __v).failed())
 		  __err |= ios_base::badbit;
 	      }