diff --git a/spack-environment/dev/spack.yaml b/spack-environment/dev/spack.yaml
index 3cf257d1d4dcf44eb513f6d215c702ef0fd2d426..b619f582c751cfb0b144cf92db8cba06245edbd5 100644
--- a/spack-environment/dev/spack.yaml
+++ b/spack-environment/dev/spack.yaml
@@ -3,7 +3,7 @@ spack:
   - ../concretizer.yaml
   - ../packages.yaml
   specs:
-    - acts@21.1.0 +dd4hep +identification +json +tgeo +examples +fatras +geant4 +python
+    - acts@21.1.0 +dd4hep +identification +json +tgeo +examples +fatras +geant4 +python build_type=RelWithDebInfo
     - actsvg@0.4.26 +examples
     - acts-dd4hep@1.0.1
     - afterburner@0.1.2 +root +zlib