diff --git a/environments/key4hep-common/packages.yaml b/environments/key4hep-common/packages.yaml
index 7aa07ed7..3f52aa7d 100644
--- a/environments/key4hep-common/packages.yaml
+++ b/environments/key4hep-common/packages.yaml
@@ -41,9 +41,7 @@ packages:
   madgraph5amc:
     require: '@3: +pythia8'
   rivet:
-    require:
-      - hepmc=3
-      - "@:3"
+    require: '@:3 hepmc=3'
   podio:
     require: +datasource+rntuple+rpath+sio
   py-numpy: