diff --git a/deps/SZ/sz/src/sz.c b/deps/SZ/sz/src/sz.c
index 87060b8012b4e768a350a48e57e97ace45927771..4d3b0adbbe23ac755e0d5eaeef649ff03919e433 100644
--- a/deps/SZ/sz/src/sz.c
+++ b/deps/SZ/sz/src/sz.c
@@ -162,6 +162,8 @@ void SZ_Finalize()
 
 
 #ifdef WINDOWS
+#include <windows.h>
+
 int gettimeofday(struct timeval *tv, struct timezone *tz) {
   time_t t;
   t = time(NULL);