diff --git a/samples/matlab_experimental/diamond_cvd.m b/samples/matlab_experimental/diamond_cvd.m
index fd5803df71..651d4ec6f6 100644
--- a/samples/matlab_experimental/diamond_cvd.m
+++ b/samples/matlab_experimental/diamond_cvd.m
@@ -56,7 +56,7 @@
 
 %% Advance Coverages
 
-iC = surf_phase.kineticsSpeciesIndex('C(d)', 'diamond');
+iC = surf_phase.kineticsSpeciesIndex('C(d)');
 
 xx = [];
 rr = [];
diff --git a/samples/python/kinetics/diamond_cvd.py b/samples/python/kinetics/diamond_cvd.py
index 60354a42f5..6c249701d6 100644
--- a/samples/python/kinetics/diamond_cvd.py
+++ b/samples/python/kinetics/diamond_cvd.py
@@ -41,7 +41,7 @@
     writer.writerow(['H mole Fraction', 'Growth Rate (microns/hour)'] +
                     d.species_names)
 
-    iC = d.kinetics_species_index(dbulk.species_index('C(d)'), 1)
+    iC = d.kinetics_species_index('C(d)')
 
     for n in range(20):
         x[ih] /= 1.4