diff --git a/src/bsoncxx/CMakeLists.txt b/src/bsoncxx/CMakeLists.txt
index 2332c61ffb..f1624d2516 100644
--- a/src/bsoncxx/CMakeLists.txt
+++ b/src/bsoncxx/CMakeLists.txt
@@ -19,7 +19,7 @@ project(BSONCXX)
 set(BSONCXX_VERSION_MAJOR 3)
 set(BSONCXX_VERSION_MINOR 1)
 set(BSONCXX_VERSION_PATCH 0)
-set(BSONCXX_VERSION_EXTRA "")
+set(BSONCXX_VERSION_EXTRA "-rc0")
 set(BSONCXX_ABI_VERSION _noabi)
 
 set(BSONCXX_POLY_USE_MNMLSTC_DEFAULT ON)
diff --git a/src/mongocxx/CMakeLists.txt b/src/mongocxx/CMakeLists.txt
index 4c96b41218..f93ddacace 100644
--- a/src/mongocxx/CMakeLists.txt
+++ b/src/mongocxx/CMakeLists.txt
@@ -27,7 +27,7 @@ find_package(LibMongoC ${LIBMONGOC_REQUIRED_VERSION} REQUIRED)
 set(MONGOCXX_VERSION_MAJOR 3)
 set(MONGOCXX_VERSION_MINOR 1)
 set(MONGOCXX_VERSION_PATCH 0)
-set(MONGOCXX_VERSION_EXTRA "")
+set(MONGOCXX_VERSION_EXTRA "-rc0")
 set(MONGOCXX_ABI_VERSION _noabi)
 
 option(MONGOCXX_ENABLE_SSL "Enable SSL - if the underlying C driver offers it" ON)