Fix memory corruption
diff --git a/src/cpp/client/secure_credentials.cc b/src/cpp/client/secure_credentials.cc
index 21445c9..7fc315b 100644
--- a/src/cpp/client/secure_credentials.cc
+++ b/src/cpp/client/secure_credentials.cc
@@ -206,8 +206,8 @@
   std::vector<grpc_metadata> md;
   for (auto it = metadata.begin(); it != metadata.end(); ++it) {
     grpc_metadata md_entry;
-    md_entry.key = SliceReferencingString(it->first);
-    md_entry.value = SliceReferencingString(it->second);
+    md_entry.key = SliceFromCopiedString(it->first);
+    md_entry.value = SliceFromCopiedString(it->second);
     md_entry.flags = 0;
     md.push_back(md_entry);
   }