diff --git a/src/time/zoneinfo_unix.go b/src/time/zoneinfo_unix.go
index ed9502d..c2569e7 100644
--- a/src/time/zoneinfo_unix.go
+++ b/src/time/zoneinfo_unix.go
@@ -32,14 +32,14 @@ var zoneDirs = []string{
 	"/usr/share/zoneinfo/",
 	"/usr/share/lib/zoneinfo/",
 	"/usr/lib/locale/TZ/",
-	runtime.GOROOT() + "/lib/time/zoneinfo.zip",
 }
 
 var origZoneDirs = zoneDirs
 
 func forceZipFileForTesting(zipOnly bool) {
-	zoneDirs = make([]string, len(origZoneDirs))
+	zoneDirs = make([]string, len(origZoneDirs)+1)
 	copy(zoneDirs, origZoneDirs)
+	zoneDirs = append(zoneDirs, runtime.GOROOT()+"/lib/time/zoneinfo.zip")
 	if zipOnly {
 		for i := 0; i < len(zoneDirs)-1; i++ {
 			zoneDirs[i] = "/XXXNOEXIST"