diff --git a/test/css/samples/custom-prefix-has-only-disallowed-characters/expected.css b/test/css/samples/custom-prefix-has-only-disallowed-characters/expected.css
index 7d3ce1908f..5e31d0bc6b 100644
--- a/test/css/samples/custom-prefix-has-only-disallowed-characters/expected.css
+++ b/test/css/samples/custom-prefix-has-only-disallowed-characters/expected.css
@@ -1 +1 @@
-div.svelte-1tjtw78{color:blue}
\ No newline at end of file
+div.svelte-xyz{color:blue}
\ No newline at end of file
diff --git a/test/css/samples/custom-prefix-no-string/expected.css b/test/css/samples/custom-prefix-no-string/expected.css
index 7d3ce1908f..5e31d0bc6b 100644
--- a/test/css/samples/custom-prefix-no-string/expected.css
+++ b/test/css/samples/custom-prefix-no-string/expected.css
@@ -1 +1 @@
-div.svelte-1tjtw78{color:blue}
\ No newline at end of file
+div.svelte-xyz{color:blue}
\ No newline at end of file