diff --git a/src/protocols/secure_channel/CASEServer.cpp b/src/protocols/secure_channel/CASEServer.cpp
index 2a6a7783d6bf16..8eb131204c342b 100644
--- a/src/protocols/secure_channel/CASEServer.cpp
+++ b/src/protocols/secure_channel/CASEServer.cpp
@@ -162,7 +162,7 @@ void CASEServer::OnSessionEstablishmentError(CHIP_ERROR err)
     // from a SessionDelegate::OnSessionReleased callback. Schedule the preparation as an async work item.
     //
     mSessionManager->SystemLayer()->ScheduleWork(
-        [](auto * systemLayer, auto * appState) {
+        [](auto * systemLayer, auto * appState) -> void {
             CASEServer * _this = static_cast<CASEServer *>(appState);
             _this->PrepareForSessionEstablishment();
         },