diff --git a/mem/mem_windows.go b/mem/mem_windows.go
index ced0b19..a925faa 100644
--- a/mem/mem_windows.go
+++ b/mem/mem_windows.go
@@ -42,6 +42,7 @@ func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
 	ret := &VirtualMemoryStat{
 		Total:       memInfo.ullTotalPhys,
 		Available:   memInfo.ullAvailPhys,
+		Free:        memInfo.ullAvailPhys,
 		UsedPercent: float64(memInfo.dwMemoryLoad),
 	}