diff --git a/cpp/cmake/thirdparty/get_flatbuffers.cmake b/cpp/cmake/thirdparty/get_flatbuffers.cmake
index b0ece38b8ef..6a889566300 100644
--- a/cpp/cmake/thirdparty/get_flatbuffers.cmake
+++ b/cpp/cmake/thirdparty/get_flatbuffers.cmake
@@ -22,6 +22,7 @@ function(find_and_configure_flatbuffers VERSION)
     GIT_REPOSITORY https://github.com/google/flatbuffers.git
     GIT_TAG v${VERSION}
     GIT_SHALLOW TRUE
+    EXCLUDE_FROM_ALL TRUE
   )
 
   rapids_export_find_package_root(
diff --git a/cpp/cmake/thirdparty/get_nanoarrow.cmake b/cpp/cmake/thirdparty/get_nanoarrow.cmake
index d7d7fcca044..4fc742dea2e 100644
--- a/cpp/cmake/thirdparty/get_nanoarrow.cmake
+++ b/cpp/cmake/thirdparty/get_nanoarrow.cmake
@@ -26,6 +26,7 @@ function(find_and_configure_nanoarrow)
     GLOBAL_TARGETS nanoarrow
     CPM_ARGS
     OPTIONS "BUILD_SHARED_LIBS OFF" "NANOARROW_NAMESPACE cudf"
+    EXCLUDE_FROM_ALL TRUE
   )
   set_target_properties(nanoarrow PROPERTIES POSITION_INDEPENDENT_CODE ON)
   rapids_export_find_package_root(BUILD nanoarrow "${nanoarrow_BINARY_DIR}" EXPORT_SET cudf-exports)