diff --git a/test/decoupled/1p/test_diffusion3d.cc b/test/decoupled/1p/test_diffusion3d.cc
index ce8db4c14329732bd8b3236c5e755cf551f01a93..d81770354c94fb7116dd2551d953045e9e7efaf6 100644
--- a/test/decoupled/1p/test_diffusion3d.cc
+++ b/test/decoupled/1p/test_diffusion3d.cc
@@ -25,7 +25,7 @@
 #include "config.h"
 #include <iostream>
 
-#if HAVE_ALUGRID | HAVE_UG
+#if HAVE_ALUGRID || HAVE_UG
 
 #include <dune/common/exceptions.hh>
 #include <dune/common/parallel/mpihelper.hh>