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