diff --git a/test/sumfact/poisson/sliced.mini b/test/sumfact/poisson/sliced.mini
index 208869cabad20e6b88a53fa17f1d5c6ae6c98cbe..e2e8493657bf8d9221b243224685ed29caa7974d 100644
--- a/test/sumfact/poisson/sliced.mini
+++ b/test/sumfact/poisson/sliced.mini
@@ -1,6 +1,6 @@
 __name = sumfact_poisson_dg_3d_sliced
 
-cells = 8 8 8
+cells = 2 2 2
 extension = 1. 1. 1.
 
 [wrapper.vtkcompare]