diff --git a/src/mime/multipart/multipart.go b/src/mime/multipart/multipart.go
index aa05ac8f9c..b3a904f0af 100644
--- a/src/mime/multipart/multipart.go
+++ b/src/mime/multipart/multipart.go
@@ -360,7 +360,7 @@ func (r *Reader) nextPart(rawPart bool) (*Part, error) {
 			return nil, io.EOF
 		}
 		if err != nil {
-			return nil, fmt.Errorf("multipart: NextPart: %v", err)
+			return nil, fmt.Errorf("multipart: NextPart: %w", err)
 		}
 
 		if r.isBoundaryDelimiterLine(line) {