diff --git a/templates/goshared/msg.go b/templates/goshared/msg.go
index 98657f495..f3030da12 100644
--- a/templates/goshared/msg.go
+++ b/templates/goshared/msg.go
@@ -95,7 +95,7 @@ type {{ multierrname . }} []error
 
 // Error returns a concatenation of all the error messages it wraps.
 func (m {{ multierrname . }}) Error() string {
-	var msgs []string
+	msgs := make([]string, 0, len(m))
 	for _, err := range m {
 		msgs = append(msgs, err.Error())
 	}