diff --git a/benchmarks/descriptor.proto b/benchmarks/descriptor.proto
index db16ebc5cb..a912dbf2ef 100644
--- a/benchmarks/descriptor.proto
+++ b/benchmarks/descriptor.proto
@@ -44,7 +44,7 @@ option go_package = "google.golang.org/protobuf/types/descriptorpb";
 option java_package = "com.google.protobuf";
 option java_outer_classname = "DescriptorProtos";
 option csharp_namespace = "Google.Protobuf.Reflection";
-option objc_class_prefix = "GPB";
+option objc_class_prefix = "UPBB";
 option cc_enable_arenas = true;
 
 // The protocol compiler can output a FileDescriptorSet containing the .proto