diff --git a/var/spack/repos/builtin/packages/petsc/package.py b/var/spack/repos/builtin/packages/petsc/package.py
index ff99da1feb4..40283927238 100644
--- a/var/spack/repos/builtin/packages/petsc/package.py
+++ b/var/spack/repos/builtin/packages/petsc/package.py
@@ -395,7 +395,7 @@ def install(self, spec, prefix):
                 ('hdf5:hl,fortran', 'hdf5', True, True),
                 'zlib',
                 'mumps',
-                'trilinos',
+                ('trilinos', 'trilinos', False, False),
                 ('fftw:mpi', 'fftw', True, True),
                 ('valgrind', 'valgrind', False, False),
                 'gmp',