diff --git a/theme/keywind/login/webauthn-register.ftl b/theme/keywind/login/webauthn-register.ftl
index 57f4dad..b12ecc9 100644
--- a/theme/keywind/login/webauthn-register.ftl
+++ b/theme/keywind/login/webauthn-register.ftl
@@ -44,7 +44,7 @@
       requireResidentKey: '${requireResidentKey}',
       rpEntityName: '${rpEntityName}',
       rpId: '${rpId}',
-      signatureAlgorithms: '${signatureAlgorithms}',
+      signatureAlgorithms: "<#if signatureAlgorithms?is_enumerable>${signatureAlgorithms?join(",")}<#else>${signatureAlgorithms}</#if>",
       unsupportedBrowserText: '${msg("webauthn-unsupported-browser-text")?no_esc}',
       userId: '${userid}',
       userVerificationRequirement: '${userVerificationRequirement}',