diff --git a/gson/src/main/java/com/google/gson/MappedObjectConstructor.java b/gson/src/main/java/com/google/gson/MappedObjectConstructor.java
index 2136c4f8..9d8c91cc 100644
--- a/gson/src/main/java/com/google/gson/MappedObjectConstructor.java
+++ b/gson/src/main/java/com/google/gson/MappedObjectConstructor.java
@@ -100,7 +100,7 @@ final class MappedObjectConstructor implements ObjectConstructor {
    */
   <T> void register(Type typeOfT, InstanceCreator<? extends T> creator) {
     if (instanceCreatorMap.hasSpecificHandlerFor(typeOfT)) {
-      log.log(Level.WARNING, "Overriding the existing InstanceCreator for " + typeOfT);
+      log.log(Level.WARNING, "Overriding the existing InstanceCreator for {0}", typeOfT);
     }
     instanceCreatorMap.register(typeOfT, creator);
   }
diff --git a/gson/src/main/java/com/google/gson/ParameterizedTypeHandlerMap.java b/gson/src/main/java/com/google/gson/ParameterizedTypeHandlerMap.java
index 1eaf697c..388ccdc9 100644
--- a/gson/src/main/java/com/google/gson/ParameterizedTypeHandlerMap.java
+++ b/gson/src/main/java/com/google/gson/ParameterizedTypeHandlerMap.java
@@ -46,8 +46,7 @@ final class ParameterizedTypeHandlerMap<T> {
           "Attempted to modify an unmodifiable map.");
     }
     if (hasSpecificHandlerFor(typeOfT)) {
-      logger.log(Level.WARNING,
-          "Overriding the existing type handler for " + typeOfT);
+      logger.log(Level.WARNING, "Overriding the existing type handler for {0}", typeOfT);
     }
     map.put(typeOfT, value);
   }