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diff --git a/bin/tests/system/tkey/ns1/named.conf.in b/bin/tests/system/tkey/ns1/named.conf.in
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index 50600b7..b0f1700 100644
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--- a/bin/tests/system/tkey/ns1/named.conf.in
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+++ b/bin/tests/system/tkey/ns1/named.conf.in
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@@ -32,6 +32,7 @@ options {
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 	tkey-domain "server";
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 	tkey-dhkey "server" KEYID;
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 	allow-query-cache { any; };
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+	random-device "/dev/urandom";
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 };
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 key rndc_key {