diff --git a/lib/Basics/operating-system.h b/lib/Basics/operating-system.h
index be8212cd60..ace64b6cd9 100644
--- a/lib/Basics/operating-system.h
+++ b/lib/Basics/operating-system.h
@@ -634,7 +634,7 @@
 
 #define TRI_HAVE_LINENOISE                  1
 
-#define GLOBAL_TIMEZONE                     timezone
+#define GLOBAL_TIMEZONE                     _timezone
 #define TRI_HAVE_GLOBAL_TIMEZONE_PROTO      1
 
 #define YY_NO_UNISTD_H                      1