diff --git a/CHANGELOG.md b/CHANGELOG.md
index c247426f61..0d5ac0c38d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # [Unreleased](https://github.com/pybamm-team/PyBaMM/)
 
+## Bug fixes
+
+Corrected initial SEI thickness for OKane2022 parameter set. ([#2218](https://github.com/pybamm-team/PyBaMM/pull/2218))
+
 ## Optimizations
 
 -   Added limits for variables in some functions to avoid division by zero, sqrt(negative number), etc ([#2213](https://github.com/pybamm-team/PyBaMM/pull/2213))
diff --git a/pybamm/input/parameters/lithium_ion/seis/OKane2022/parameters.csv b/pybamm/input/parameters/lithium_ion/seis/OKane2022/parameters.csv
index fb2be7c3e6..bb526f9cf6 100644
--- a/pybamm/input/parameters/lithium_ion/seis/OKane2022/parameters.csv
+++ b/pybamm/input/parameters/lithium_ion/seis/OKane2022/parameters.csv
@@ -15,7 +15,7 @@ Inner SEI electron conductivity [S.m-1],8.95E-14, Single paper,
 Inner SEI lithium interstitial diffusivity [m2.s-1],1E-20, Guess,
 Lithium interstitial reference concentration [mol.m-3],15, Single paper,
 Initial inner SEI thickness [m], 0, 1/2 of initial thickness in Safari paper,
-Initial outer SEI thickness [m], 2.5E-9, 1/2 of initial thickness in Safari paper,
+Initial outer SEI thickness [m], 5E-9, 1/2 of initial thickness in Safari paper,
 EC initial concentration in electrolyte [mol.m-3], 4.541E3, Safari paper,
 EC diffusivity [m2.s-1], 2E-18, adjusted parameter in Yang paper,
 SEI kinetic rate constant [m.s-1], 1e-12, adjusted parameter in Yang paper,