diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 6d102982cb..30c864df63 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -402,7 +402,8 @@ loop:
 			break;
 
 		case 1:
-			n->type = n->type->type->type;
+			if(n->type != T && n->type->type != T && n->type->type->type != T)
+				n->type = n->type->type->type;
 			break;
 		}