diff --git a/src/syscall/zx/handle.go b/src/syscall/zx/handle.go
index 040f6e0..5e77328 100644
--- a/src/syscall/zx/handle.go
+++ b/src/syscall/zx/handle.go
@@ -588,7 +588,9 @@
 	Text   string
 }
 
-func (e Error) Error() string {
+var _ error = (*Error)(nil)
+
+func (e *Error) Error() string {
 	if e.Text == "" {
 		return "zx.Status: " + e.Status.String()
 	}