diff --git a/gnu/lib/libg++/libg++/Regex.cc b/gnu/lib/libg++/libg++/Regex.cc
index db9cdc3e7e3..37e564b8c1c 100644
--- a/gnu/lib/libg++/libg++/Regex.cc
+++ b/gnu/lib/libg++/libg++/Regex.cc
@@ -31,7 +31,7 @@ extern "C" {
 #if 1
 #include <rx.h>
 #else
-#include <regex.h>
+#include <gnuregex.h>
 #endif
 }
 
diff --git a/gnu/lib/libg++/libg++/regex.cc b/gnu/lib/libg++/libg++/regex.cc
index db23a51995b..40b8498a694 100644
--- a/gnu/lib/libg++/libg++/regex.cc
+++ b/gnu/lib/libg++/libg++/regex.cc
@@ -114,7 +114,7 @@ init_syntax_once ()
 #endif
 
 /* Get the interface, including the syntax bits.  */
-#include "regex.h"
+#include <gnuregex.h>
 
 
 /* These are the command codes that appear in compiled regular