diff --git a/source/extensions/filters/http/ext_authz/ext_authz.cc b/source/extensions/filters/http/ext_authz/ext_authz.cc
index 90df75ee279dd..2d35c70b0a0e0 100644
--- a/source/extensions/filters/http/ext_authz/ext_authz.cc
+++ b/source/extensions/filters/http/ext_authz/ext_authz.cc
@@ -162,7 +162,8 @@ Http::FilterHeadersStatus Filter::encodeHeaders(Http::ResponseHeaderMap& headers
   ENVOY_STREAM_LOG(trace,
                    "ext_authz filter has {} response header(s) to add and {} response header(s) to "
                    "set to the encoded response:",
-                   *encoder_callbacks_, response_headers_to_add_.size());
+                   *encoder_callbacks_, response_headers_to_add_.size(),
+                   response_headers_to_set_.size());
   if (!response_headers_to_add_.empty()) {
     ENVOY_STREAM_LOG(
         trace, "ext_authz filter added header(s) to the encoded response:", *encoder_callbacks_);