diff --git a/packages/dune/package.py b/packages/dune/package.py
index 93ecb4a..c172af9 100644
--- a/packages/dune/package.py
+++ b/packages/dune/package.py
@@ -197,7 +197,7 @@ class Dune(CMakePackage):
     def setup_build_environment(self, env):
         # We reset the DUNE_CONTROL_PATH here because any entries in this
         # path that contain Dune modules will break the Spack build process.
-        env.set('DUNE_CONTROL_PATH', self.prefix)
+        env.set('DUNE_CONTROL_PATH', '')
 
     def setup_run_environment(self, env):
         # Some scripts search the DUNE_CONTROL_PATH for Dune modules (e.g. duneproject).