diff --git a/src/prim/windows/prim.c b/src/prim/windows/prim.c
index f91925fc..31ef0e94 100644
--- a/src/prim/windows/prim.c
+++ b/src/prim/windows/prim.c
@@ -127,10 +127,10 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
   config->has_partial_free = false;
   config->has_virtual_reserve = true;
   // windows version
-  OSVERSIONINFOW version{sizeof(version)};
+  OSVERSIONINFOW version; _mi_memzero_var(version);
   if (GetVersionExW(&version)) {
-      win_major_version = version.dwMajorVersion;
-      win_minor_version = version.dwMinorVersion;
+    win_major_version = version.dwMajorVersion;
+    win_minor_version = version.dwMinorVersion;
   }
   // get the page size
   SYSTEM_INFO si;