diff --git a/fuzz/ssl_ctx_api.cc b/fuzz/ssl_ctx_api.cc
index 1566e79..ac6202d7 100644
--- a/fuzz/ssl_ctx_api.cc
+++ b/fuzz/ssl_ctx_api.cc
@@ -213,7 +213,7 @@
     assert(cert_.get() != nullptr);
 
     certs_.reset(sk_X509_new_null());
-    PushToStack(certs_.get(), UpRef(cert_));
+    bssl::PushToStack(certs_.get(), bssl::UpRef(cert_));
   }
 
   bssl::UniquePtr<EVP_PKEY> pkey_;