diff --git a/7z.go b/7z.go
index 44f8a00b..d57bd452 100644
--- a/7z.go
+++ b/7z.go
@@ -82,6 +82,7 @@ func (z SevenZip) Extract(ctx context.Context, sourceArchive io.Reader, pathsInA
 	skipDirs := skipList{}
 
 	for i, f := range zr.File {
+		f := f // make a copy for the Open closure
 		if err := ctx.Err(); err != nil {
 			return err // honor context cancellation
 		}