diff --git a/spack-environment/packages.yaml b/spack-environment/packages.yaml
index ec04c030163f078b62437a002eb76d781bc38781..44e1227c7afa317c20e38377fab20b15e57665ab 100644
--- a/spack-environment/packages.yaml
+++ b/spack-environment/packages.yaml
@@ -378,7 +378,6 @@ packages:
     - '@3.6.0'
   py-protobuf:
     require:
-    - '%clang'
     - '@5.28.2'
   py-pygithub:
     require:
@@ -397,6 +396,7 @@ packages:
     - '@0.13.2'
   py-tensorflow:
     require:
+    - '%clang'
     - '@2.18'
   py-toml:
     require: