diff --git a/src/cmd/compile/internal/typecheck/const.go b/src/cmd/compile/internal/typecheck/const.go
index 2ac489aeef..9ad37033fd 100644
--- a/src/cmd/compile/internal/typecheck/const.go
+++ b/src/cmd/compile/internal/typecheck/const.go
@@ -305,8 +305,7 @@ func toint(v constant.Value) constant.Value {
 	}
 
 	// Prevent follow-on errors.
-	// TODO(mdempsky): Use constant.MakeUnknown() instead.
-	return constant.MakeInt64(1)
+	return constant.MakeUnknown()
 }
 
 func tostr(v constant.Value) constant.Value {