diff --git a/src/main/java/graphql/cachecontrol/CacheControl.java b/src/main/java/graphql/cachecontrol/CacheControl.java
index 1f5059f11..aef4141c9 100644
--- a/src/main/java/graphql/cachecontrol/CacheControl.java
+++ b/src/main/java/graphql/cachecontrol/CacheControl.java
@@ -42,7 +42,7 @@ public enum Scope {
         PUBLIC, PRIVATE
     }
 
-    private class Hint {
+    private static final class Hint {
         private final List<Object> path;
         private final Integer maxAge;
         private final Scope scope;
diff --git a/src/main/java/graphql/schema/GraphQLTypeResolvingVisitor.java b/src/main/java/graphql/schema/GraphQLTypeResolvingVisitor.java
index d5faa84b8..0380ac5cd 100644
--- a/src/main/java/graphql/schema/GraphQLTypeResolvingVisitor.java
+++ b/src/main/java/graphql/schema/GraphQLTypeResolvingVisitor.java
@@ -60,8 +60,8 @@ public TraversalControl visitBackRef(TraverserContext<GraphQLSchemaElement> cont
         return CONTINUE;
     }
 
-    private class TypeRefResolvingVisitor extends GraphQLTypeVisitorStub {
-        protected final GraphQLType resolvedType;
+    private static final class TypeRefResolvingVisitor extends GraphQLTypeVisitorStub {
+        private final GraphQLType resolvedType;
 
         TypeRefResolvingVisitor(GraphQLType resolvedType) {
             this.resolvedType = resolvedType;