diff --git a/test/main/cpp/keyctrl.cpp b/test/main/cpp/keyctrl.cpp
index d04e4a9..8ae1eb4 100644
--- a/test/main/cpp/keyctrl.cpp
+++ b/test/main/cpp/keyctrl.cpp
@@ -463,7 +463,7 @@ Sec_Result testKeyCtrlProvision32bit2038(int version, const char* alg) {
     }
 #else
     if (SecKey_Provision(ctx.proc(), SEC_OBJECTID_USER_BASE, SEC_STORAGELOC_RAM, SEC_KEYCONTAINER_JTYPE,
-                reinterpret_cast<SEC_BYTE*>(jtype.data()), jtype.size()) == SEC_RESULT_SUCCESS) {
+                reinterpret_cast<SEC_BYTE*>(&jtype[0]), jtype.size()) == SEC_RESULT_SUCCESS) {
         SEC_LOG_ERROR("Expecting SecKey_Provision to fail on jtype with date '%s'", notOnOrAfter);
         return SEC_RESULT_FAILURE;
     }