diff --git a/include/cantera/kinetics/InterfaceKinetics.h b/include/cantera/kinetics/InterfaceKinetics.h
index fad5c79e6..6b7802c7a 100644
--- a/include/cantera/kinetics/InterfaceKinetics.h
+++ b/include/cantera/kinetics/InterfaceKinetics.h
@@ -271,6 +271,7 @@ public:
 
     void setIOFlag(int ioFlag);
 
+    //! @deprecated To be removed after Cantera 2.3.
     void checkPartialEquil();
 
     //! Update the standard state chemical potentials and species equilibrium
diff --git a/src/kinetics/InterfaceKinetics.cpp b/src/kinetics/InterfaceKinetics.cpp
index f7daad4f4..13fd1cf42 100644
--- a/src/kinetics/InterfaceKinetics.cpp
+++ b/src/kinetics/InterfaceKinetics.cpp
@@ -238,6 +238,8 @@ void InterfaceKinetics::updateMu0()
 
 void InterfaceKinetics::checkPartialEquil()
 {
+    warn_deprecated("InterfaceKinetics::checkPartialEquil",
+                    "To be removed after Cantera 2.3.");
     // First task is update the electrical potentials from the Phases
     _update_rates_phi();