diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 8b736c7b0..87a8bab25 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -356,10 +356,6 @@ ROKEN_CPP_START
 
 #define fsync   _commit
 
-#define timezone    _timezone
-
-#define tzname  _tzname
-
 #define _PIPE_BUFFER_SZ 8192
 #define pipe(fds) _pipe((fds), _PIPE_BUFFER_SZ, O_BINARY);
 
diff --git a/lib/roken/strftime.c b/lib/roken/strftime.c
index 447c15543..1dbc6fa9c 100644
--- a/lib/roken/strftime.c
+++ b/lib/roken/strftime.c
@@ -36,6 +36,11 @@
 #include "strpftime-test.h"
 #endif
 
+#if defined(_WIN32)
+# define timezone _timezone
+# define tzname   _tzname
+#endif
+
 static const char *abb_weekdays[] = {
     "Sun",
     "Mon",