diff --git a/gcc/defaults.h b/gcc/defaults.h
index 376687d91b1..613003eb14f 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -1444,7 +1444,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 /* When generating dwarf info, the default standard version we'll honor
    and advertise in absence of -gdwarf-<N> on the command line.  */
 #ifndef DWARF_VERSION_DEFAULT
-#define DWARF_VERSION_DEFAULT 5
+#define DWARF_VERSION_DEFAULT 4
 #endif
 
 #ifndef USED_FOR_TARGET
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 04ca9d9b02b..944019edbc1 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -11255,9 +11255,8 @@ possible.
 @itemx -gdwarf-@var{version}
 Produce debugging information in DWARF format (if that is supported).
 The value of @var{version} may be either 2, 3, 4 or 5; the default
-version for most targets is 5 (with the exception of VxWorks, TPF and
-Darwin/Mac OS X, which default to version 2, and AIX, which defaults
-to version 4).
+version for most targets is 4 (with the exception of VxWorks, TPF and
+Darwin/Mac OS X, which default to version 2).
 
 Note that with DWARF Version 2, some ports require and always
 use some non-conflicting DWARF 3 extensions in the unwind tables.