diff --git a/cmake/GoogleCloudCppFeatures.cmake b/cmake/GoogleCloudCppFeatures.cmake
index 58f9bd19b6d69..f0b1c0ff5d0e8 100644
--- a/cmake/GoogleCloudCppFeatures.cmake
+++ b/cmake/GoogleCloudCppFeatures.cmake
@@ -362,9 +362,6 @@ macro (google_cloud_cpp_enable_cleanup)
         OR (sql IN_LIST GOOGLE_CLOUD_CPP_ENABLE)
         OR (generator IN_LIST GOOGLE_CLOUD_CPP_ENABLE))
         set(GOOGLE_CLOUD_CPP_ENABLE_REST ON)
-        # Backwards compatibility. In the original release of `oauth2` we
-        # automatically compiled the library if REST was enabled
-        list(APPEND GOOGLE_CLOUD_CPP_ENABLE oauth2)
     endif ()
 
     list(REMOVE_DUPLICATES GOOGLE_CLOUD_CPP_ENABLE)