diff --git a/src/app/clusters/thermostat-server/thermostat-server.cpp b/src/app/clusters/thermostat-server/thermostat-server.cpp
index 059616b128f97d..a7895849dd319e 100644
--- a/src/app/clusters/thermostat-server/thermostat-server.cpp
+++ b/src/app/clusters/thermostat-server/thermostat-server.cpp
@@ -408,7 +408,7 @@ uint8_t CountUpdatedPresetsAfterApplyingPendingPresets(Delegate * delegate)
         numberOfPendingPresets++;
     }
 
-    return numberOfPresets + numberOfPendingPresets - numberOfMatches;
+    return static_cast<uint8_t>(numberOfPresets + numberOfPendingPresets - numberOfMatches);
 }
 
 /**