diff --git a/NEWS b/NEWS
index 7082960a2..564484f8a 100644
--- a/NEWS
+++ b/NEWS
@@ -15,6 +15,7 @@ Changes in 1.8.8 (since 1.8.7)
 ** Fix `wrong type arg' exceptions with IPv6 addresses
 ** Fix typos in `(srfi srfi-19)'
 ** Have `(srfi srfi-35)' provide named struct vtables
+** Fix some Interix build problems
 
 
 Changes in 1.8.7 (since 1.8.6)
diff --git a/THANKS b/THANKS
index 5cc88b3de..48a105aaa 100644
--- a/THANKS
+++ b/THANKS
@@ -65,6 +65,7 @@ For fixes or providing information which led to a fix:
        Matthias Köppe
            Matt Kraai
          Daniel Kraft
+            Jay Krell
            Jeff Long
 	  Marco Maggi
         Gregory Marton
diff --git a/libguile/filesys.c b/libguile/filesys.c
index 70dfe15e4..c8acb13ef 100644
--- a/libguile/filesys.c
+++ b/libguile/filesys.c
@@ -23,6 +23,9 @@
 #ifdef __hpux
 #define _POSIX_C_SOURCE 199506L  /* for readdir_r */
 #endif
+#if defined(__INTERIX) && !defined(_REENTRANT)
+# define _REENTRANT   /* ask Interix for readdir_r prototype */
+#endif
 
 #ifdef HAVE_CONFIG_H
 #  include <config.h>