diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index e6bc02a02e56..e4b3dff440d8 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2001-02-14  Jeffrey Oldham  <oldham@codesourcery.com>
+
+        * include/bits/c++config (_GLIBCPP_FULLY_COMPLIANT_HEADERS):
+        Define so library is compliant.
+
 2001-02-15  Anthony Green  <green@redhat.com>
 
         * acinclude.m4 (glibcpp_toolexeclibdir): Fix test for cross
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index d47ce4250285..17263b1a1eea 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -47,7 +47,7 @@
 // types. For the io library, this means that larger, out-of-line
 // member functions are only declared, and definitions are not parsed
 // by the compiler, but instead instantiated into the library binary.
-//#define _GLIBCPP_FULLY_COMPLIANT_HEADERS 1
+#define _GLIBCPP_FULLY_COMPLIANT_HEADERS 1
 
 // To enable older, ARM-style iostreams and other anachronisms use this.
 //#define _GLIBCPP_DEPRECATED 1