1 files changed, 1 insertions, 1 deletions
diff --git a/hpmr.py b/hpmr.py
index f1d4ea3..d33532b 100755
--- a/hpmr.py
+++ b/hpmr.py
@@ -654,7 +654,7 @@ else:
                       openmc.Cell(name="Heat Pipe Wick",fill=mat_pipe_wick_smear,region=+geo_pipe_cylinders[0]&-geo_pipe_cylinders[1]),
                       openmc.Cell(name="Heat Pipe K Layer",fill=mat_pipe_k_liquid,region=+geo_pipe_cylinders[1]&-geo_pipe_cylinders[2]),
                       openmc.Cell(name="Heat Pipe SS316 Envelope",fill=mat_pipe_ss316,region=+geo_pipe_cylinders[2]&-geo_pipe_cylinders[3]),
-                      openmc.Cell(name="Heat Pipe Helium Gap",fill=mat_pipe_he_gap_smear,region=+geo_pipe_cylinders[3]&-geo_pipe_cylinders[4]),
+                      openmc.Cell(name="Heat Pipe Helium Gap",fill=mat_pipe_helium,region=+geo_pipe_cylinders[3]&-geo_pipe_cylinders[4]),
                       openmc.Cell(name="Heat Pipe Graphite Matrix",fill=mat_graphite_matrix,region=+geo_pipe_cylinders[4])]
 
 # Assign to a universe