diff --git a/src/lib/w32/strptime.c b/src/lib/w32/strptime.c
index 123f4c7b..04b83eeb 100644
--- a/src/lib/w32/strptime.c
+++ b/src/lib/w32/strptime.c
@@ -4,6 +4,9 @@
  */
 
 #include "w32misc.h"
+#ifdef _MSC_VER
+#define tzname _tzname
+#endif
 
 typedef unsigned char u_char;
 typedef unsigned int uint;