diff --git a/samples/grand_canonical.py b/samples/grand_canonical.py
index bc5fa32f57a..38e312bfd77 100644
--- a/samples/grand_canonical.py
+++ b/samples/grand_canonical.py
@@ -43,10 +43,10 @@
 
 parser = argparse.ArgumentParser(epilog=__doc__ + epilog)
 parser.add_argument('cs_bulk', type=float,
-                    help="bulk salt concentration [1/sigma^3]")
+                    help="bulk salt concentration [1/sigma^3], e.g. 1e-3")
 parser.add_argument('excess_chemical_potential', type=float,
-                    help="excess chemical potential [kT] "
-                         "(obtained from Widom's insertion method)")
+                    help="excess chemical potential [kT] (obtained from "
+                         "Widom's insertion method), e.g. -0.36")
 args = parser.parse_args()
 
 # System parameters
diff --git a/samples/lb_profile.py b/samples/lb_profile.py
index 9d599af91fa..b3cb65da2f7 100644
--- a/samples/lb_profile.py
+++ b/samples/lb_profile.py
@@ -71,7 +71,6 @@
 system.integrator.run(n_steps)
 
 lb_fluid_profile = accumulator.get_mean()
-lb_fluid_profile = np.reshape(lb_fluid_profile, (100, 1, 1, 3))
 
 
 def poiseuille_flow(r, R, ext_force_density):
diff --git a/samples/widom_insertion.py b/samples/widom_insertion.py
index e44b4701d73..dc6672341a7 100644
--- a/samples/widom_insertion.py
+++ b/samples/widom_insertion.py
@@ -32,7 +32,7 @@
 
 parser = argparse.ArgumentParser(epilog=__doc__)
 parser.add_argument('cs_bulk', type=float,
-                    help="bulk salt concentration [1/sigma^3]")
+                    help="bulk salt concentration [1/sigma^3], e.g. 1e-3")
 args = parser.parse_args()
 
 # System parameters
diff --git a/testsuite/scripts/samples/CMakeLists.txt b/testsuite/scripts/samples/CMakeLists.txt
index 7fd4d80f588..69fcd4b459a 100644
--- a/testsuite/scripts/samples/CMakeLists.txt
+++ b/testsuite/scripts/samples/CMakeLists.txt
@@ -38,7 +38,7 @@ if(HDF5_FOUND)
 endif()
 sample_test(FILE test_lbf.py SUFFIX cpu)
 sample_test(FILE test_lbf.py SUFFIX gpu LABELS "gpu")
-sample_test(FILE test_lb_profile.py)
+sample_test(FILE test_lb_profile.py LABELS "gpu")
 sample_test(FILE test_lj_liquid_distribution.py)
 sample_test(FILE test_lj_liquid.py)
 sample_test(FILE test_lj_liquid_structurefactor.py)