diff --git a/containers/builder/spack.yaml b/containers/builder/spack.yaml
index 7a76fd8bf2354f8a5053711263b12c75ef2b0c58..24fd4bb6d053dd26118d5578d33cb157ca533744 100644
--- a/containers/builder/spack.yaml
+++ b/containers/builder/spack.yaml
@@ -12,7 +12,7 @@ spack:
     - py-numpy
     - py-pyyaml
     - xrootd@4.12.3 cxxstd=17 +python
-    - | root@6.22.00 cxxstd=17 
+    - root@6.22.00 cxxstd=17 
           +fftw +fortran +gdml +http +mlp +pythia8 
           +root7 +tmva +vc +xrootd +ssl ^mesa+opengl 
           -llvm -osmesa