diff --git a/z/calloc_nojemalloc.go b/z/calloc_nojemalloc.go
index 1adcfe7e..c8ade5f5 100644
--- a/z/calloc_nojemalloc.go
+++ b/z/calloc_nojemalloc.go
@@ -2,7 +2,7 @@
 // of this source code is governed by a BSD-style license that can be found in
 // the LICENSE file.
 
-// +build !jemalloc
+// +build !jemalloc !cgo
 
 package z