diff --git a/libs/binder/RpcSession.cpp b/libs/binder/RpcSession.cpp
index c5a8dd1..8449b3c 100644
--- a/libs/binder/RpcSession.cpp
+++ b/libs/binder/RpcSession.cpp
@@ -703,7 +703,7 @@
     return false;
 }
 
-std::string RpcSession::getCertificate(CertificateFormat format) {
+std::vector<uint8_t> RpcSession::getCertificate(CertificateFormat format) {
     return mCtx->getCertificate(format);
 }