diff --git a/var/spack/repos/builtin/packages/dealii/package.py b/var/spack/repos/builtin/packages/dealii/package.py
index 7828d0febf1..7a4c81c50e0 100644
--- a/var/spack/repos/builtin/packages/dealii/package.py
+++ b/var/spack/repos/builtin/packages/dealii/package.py
@@ -181,6 +181,8 @@ class Dealii(CMakePackage, CudaPackage):
     depends_on('slepc@:3.6.3',     when='@:8.4.1+slepc+petsc+mpi')
     depends_on('slepc~arpack',     when='+slepc+petsc+mpi+int64')
     depends_on('sundials@:3~pthread', when='@9.0:+sundials')
+    # FIXME: next line fixes concretization with trilinos and adol-c
+    depends_on('trilinos~exodus~netcdf',    when='@9.0:+adol-c+trilinos')
     depends_on('trilinos gotype=int', when='+trilinos@12.18.1:')
     # Both Trilinos and SymEngine bundle the Teuchos RCP library.
     # This leads to conflicts between macros defined in the included