diff --git a/input/thermo/groups/adsorptionPt111.py b/input/thermo/groups/adsorptionPt111.py
index 94f0c9dba2..72a10e1a78 100644
--- a/input/thermo/groups/adsorptionPt111.py
+++ b/input/thermo/groups/adsorptionPt111.py
@@ -109,8 +109,8 @@
 """
 1 * X u0 p0 c0
 2 O  u0 p2 c0 {3,S} {4,S}
-3 R  u0 p[0,1,2] c0 {2,S}
-4 R  u0 p[0,1,2] c0 {2,S}
+3 R  u0 px c0 {2,S}
+4 R  u0 px c0 {2,S}
 """,
     thermo=ThermoData(
         Tdata=([300, 400, 500, 600, 800, 1000, 1500], 'K'),