diff --git a/environments/key4hep-common/config-nightlies.yaml b/environments/key4hep-common/config-nightlies.yaml
index 63d8f9c9..4c703526 100644
--- a/environments/key4hep-common/config-nightlies.yaml
+++ b/environments/key4hep-common/config-nightlies.yaml
@@ -4,3 +4,6 @@ config:
     projections:
       all: "{architecture.target}-{architecture.os}-{compiler.name}{compiler.version}-opt/{name}/{version}-{hash:6}"
       build_type=Debug: "{architecture.target}-{architecture.os}-{compiler.name}{compiler.version}-dbg/{name}/{version}-{hash:6}"
+concretizer:
+  duplicates:
+    strategy: none