diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3473634b6..68c580c849 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ## Bug fixes
 
+-   Arrhenius function for `nmc_OKane2022` positive electrode actually gets used now ([#2309](https://github.com/pybamm-team/PyBaMM/pull/2309))
 -   Added `SEI on cracks` to loop over all interfacial reactions ([#2262](https://github.com/pybamm-team/PyBaMM/pull/2262))
 -   Fixed `X-averaged SEI on cracks concentration` so it's an average over x only, not y and z ([#2262](https://github.com/pybamm-team/PyBaMM/pull/2262))
 -   Corrected initial state for SEI on cracks ([#2262](https://github.com/pybamm-team/PyBaMM/pull/2262))
diff --git a/pybamm/input/parameters/lithium_ion/positive_electrodes/nmc_OKane2022/parameters.csv b/pybamm/input/parameters/lithium_ion/positive_electrodes/nmc_OKane2022/parameters.csv
index d5178d0115..0e5c9a39d2 100644
--- a/pybamm/input/parameters/lithium_ion/positive_electrodes/nmc_OKane2022/parameters.csv
+++ b/pybamm/input/parameters/lithium_ion/positive_electrodes/nmc_OKane2022/parameters.csv
@@ -4,7 +4,7 @@ Name [units],Value,Reference,Notes
 # Electrode properties,,,
 Positive electrode conductivity [S.m-1],0.18,Chen 2020,
 Maximum concentration in positive electrode [mol.m-3],63104,Chen 2020,tuned for 1C
-Positive electrode diffusivity [m2.s-1],4E-15,Chen 2020,tuned for 1C
+Positive electrode diffusivity [m2.s-1],[function]nmc_LGM50_diffusivity_Chen2020,Chen 2020,tuned for 1C
 Positive electrode OCP [V],[function]nmc_LGM50_ocp_Chen2020,Chen 2020,
 ,,,
 # Microstructure,,,