diff --git a/CMake/fletch-tarballs.cmake b/CMake/fletch-tarballs.cmake
index 8dd34b13..373e72a5 100644
--- a/CMake/fletch-tarballs.cmake
+++ b/CMake/fletch-tarballs.cmake
@@ -494,7 +494,7 @@ endif()
 if (WIN32)
   set(Protobuf_SELECT_VERSION "3.9.0" CACHE STRING "Select the  version of ProtoBuf to build.")
 else()
-  set(Protobuf_SELECT_VERSION "3.9.0" CACHE STRING "Select the  version of ProtoBuf to build.")
+  set(Protobuf_SELECT_VERSION "2.5.0" CACHE STRING "Select the  version of ProtoBuf to build.")
   set_property(CACHE Protobuf_SELECT_VERSION PROPERTY STRINGS "2.5.0" "3.9.0")
 endif()