diff --git a/interfaces/cython/cantera/ck2cti.py b/interfaces/cython/cantera/ck2cti.py
index dcdc1eb81..924f013cc 100644
--- a/interfaces/cython/cantera/ck2cti.py
+++ b/interfaces/cython/cantera/ck2cti.py
@@ -1268,17 +1268,17 @@ class Parser(object):
                 if chebyshev is None:
                     chebyshev = Chebyshev()
                 tokens = [t.strip() for t in tokens]
-                if 'TCHEB' in line:
-                    index = tokens.index('TCHEB')
+                if contains(tokens, 'TCHEB'):
+                    index = get_index(tokens, 'TCHEB')
                     tokens2 = tokens[index+1].split()
                     chebyshev.Tmin = float(tokens2[0].strip())
                     chebyshev.Tmax = float(tokens2[1].strip())
-                if 'PCHEB' in line:
-                    index = tokens.index('PCHEB')
+                if contains(tokens, 'PCHEB'):
+                    index = get_index(tokens, 'PCHEB')
                     tokens2 = tokens[index+1].split()
                     chebyshev.Pmin = (float(tokens2[0].strip()), 'atm')
                     chebyshev.Pmax = (float(tokens2[1].strip()), 'atm')
-                if 'TCHEB' in line or 'PCHEB' in line:
+                if contains(tokens, 'TCHEB') or contains(tokens, 'PCHEB'):
                     pass
                 elif chebyshev.degreeT == 0 or chebyshev.degreeP == 0:
                     tokens2 = tokens[1].split()
diff --git a/test/data/pdep-test.inp b/test/data/pdep-test.inp
index 8ac711ed1..1da08f7cd 100644
--- a/test/data/pdep-test.inp
+++ b/test/data/pdep-test.inp
@@ -116,12 +116,12 @@ PLOG / 100  1.28E+06    1.71    9774 /
 
 ! PLOG with duplicate rates and negative A-factors
 H+R3=P3A+P3B 1.0    0.0 0.0
-PLOG / 0.001315789  2.44E+10    1.04    3980 /
-PLOG / 0.039473684  3.89E+10    0.989   4114 /
-PLOG / 1    3.46E+12    0.442   5463 /
-PLOG / 10   1.72E+14    -0.01   7134 /
-PLOG / 100  -7.41E+30   -5.54   12108 /
-PLOG / 100  1.90E+15    -0.29   8306 /
+plog / 0.001315789  2.44E+10    1.04    3980 /
+plog / 0.039473684  3.89E+10    0.989   4114 /
+plog / 1    3.46E+12    0.442   5463 /
+plog / 10   1.72E+14    -0.01   7134 /
+plog / 100  -7.41E+30   -5.54   12108 /
+plog / 100  1.90E+15    -0.29   8306 /
 
 ! Degenerate PLOG with a single rate expression
 H+R4=H+P4 1.0 0.0 0.0
@@ -129,12 +129,12 @@ PLOG / 10       1.74e+07    1.98    4521 /
 
 ! Bimolecular CHEB
 R5+H(+m)=P5A+P5B(+m)            1.0E0 0.0 0.0
-TCHEB / 300.0 2000.0 /  PCHEB / 0.009869232667160128 98.69232667160128 /
-CHEB / 4    4 /
-CHEB / 8.2883000e+00 -1.1397000e+00 -1.2059000e-01 1.6034000e-02 /
-CHEB / 1.9764000e+00 1.0037000e+00 7.2865000e-03 -3.0432000e-02 /
-CHEB / 3.1770000e-01 2.6889000e-01 9.4806000e-02 -7.6385000e-03 /
-CHEB / -3.1285000e-02 -3.9412000e-02 4.4375000e-02 1.4458000e-02 /
+tcheb / 300.0 2000.0 /  pcheb / 0.009869232667160128 98.69232667160128 /
+cheb / 4    4 /
+cheb / 8.2883000e+00 -1.1397000e+00 -1.2059000e-01 1.6034000e-02 /
+cheb / 1.9764000e+00 1.0037000e+00 7.2865000e-03 -3.0432000e-02 /
+cheb / 3.1770000e-01 2.6889000e-01 9.4806000e-02 -7.6385000e-03 /
+cheb / -3.1285000e-02 -3.9412000e-02 4.4375000e-02 1.4458000e-02 /
 
 ! Unimolecular decomposition CHEB
 R6(+M)=P6A+P6B(+M)                          1.000e+00 0.000     0.000