diff --git a/cbits/conv.c b/cbits/conv.c
--- a/cbits/conv.c
+++ b/cbits/conv.c
@@ -4,7 +4,7 @@
 /* Linux cheats AC_CHECK_FUNCS(strptime_l), sigh. */
 #define THREAD_SAFE 0
 #define _XOPEN_SOURCE
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 #elif HAVE_STRPTIME_L
 #define THREAD_SAFE 1
 #define _GNU_SOURCE
diff --git a/unix-time.cabal b/unix-time.cabal
--- a/unix-time.cabal
+++ b/unix-time.cabal
@@ -1,6 +1,6 @@
 cabal-version:      1.18
 name:               unix-time
-version:            0.4.10
+version:            0.4.11
 license:            BSD3
 license-file:       LICENSE
 maintainer:         Kazu Yamamoto <kazu@iij.ad.jp>