diff --git a/packages/dune/package.py b/packages/dune/package.py
index 3440616..ef2417e 100644
--- a/packages/dune/package.py
+++ b/packages/dune/package.py
@@ -298,7 +298,6 @@ class Dune(CMakePackage):
     depends_on('py-sphinx', type=('build', 'run'), when='+doc')
     depends_on('py-wheel', type='build')
     depends_on('scotch+mpi')
-    depends_on('sionlib', when='+sionlib')
     depends_on('suite-sparse')
     depends_on('superlu')
     depends_on('vc')