diff --git a/runtime/internal/runtime/z_face.go b/runtime/internal/runtime/z_face.go
index af7d10de..84f82ce7 100644
--- a/runtime/internal/runtime/z_face.go
+++ b/runtime/internal/runtime/z_face.go
@@ -43,8 +43,7 @@ type interfacetype = abi.InterfaceType
 type itab struct {
 	inter *interfacetype
 	_type *_type
-	hash  uint32 // copy of _type.hash. Used for type switches.
-	_     [4]byte
+	hash  uint32     // copy of _type.hash. Used for type switches.
 	fun   [1]uintptr // variable sized. fun[0]==0 means _type does not implement inter.
 }