diff --git a/audit/api/model.go b/audit/api/model.go
index e3f9e69..92975ae 100644
--- a/audit/api/model.go
+++ b/audit/api/model.go
@@ -423,10 +423,13 @@ func NewRequestMetadata(
 	audiences []string,
 	auditClaims *structpb.Struct,
 ) *auditV1.RequestMetadata {
-
+	agent := requestHeaders["User-Agent"]
+	if agent == "" {
+		agent = requestHeaders["user-agent"]
+	}
 	return &auditV1.RequestMetadata{
 		CallerIp:                clientIp,
-		CallerSuppliedUserAgent: requestHeaders["User-Agent"],
+		CallerSuppliedUserAgent: agent,
 		RequestAttributes: NewRequestAttributes(
 			request,
 			requestHeaders,