diff --git a/gradle.properties b/gradle.properties
index f73f294..82850b7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 # speed up Gradle
 org.gradle.daemon=true
 
-version = 0.5.0
+version = 0.6.0
 group = org.immutizer4j
diff --git a/src/main/java/org/immutizer4j/Immutizer.java b/src/main/java/org/immutizer4j/Immutizer.java
index a52584b..f8849ee 100644
--- a/src/main/java/org/immutizer4j/Immutizer.java
+++ b/src/main/java/org/immutizer4j/Immutizer.java
@@ -20,16 +20,15 @@
  * @author Jacek Furmankiewicz
  */
 @Slf4j
-@Value
 public class Immutizer {
 
     // may allow arrays to pass or not (no by default)
-    private boolean strict;
+    private final boolean strict;
 
     // additional types that we were told are immutable
-    private ImmutableSet<Class<?>> safeTypes;
+    private final ImmutableSet<Class<?>> safeTypes;
 
-    private ConcurrentMap<Class<?>,ValidationResult> validationCache =
+    private final ConcurrentMap<Class<?>,ValidationResult> validationCache =
             new MapMaker()
             .concurrencyLevel(Runtime.getRuntime().availableProcessors())
             .initialCapacity(100)
@@ -127,13 +126,18 @@ public ValidationResult getValidationResult(Class<?> clazz) {
     }
 
     // performs actual walk down the graph hierarchy starting from the root object
-    private ValidationResult validateType(Class<?> entity) {
-        return validateType(entity, new ValidationResult(ImmutableSet.<ValidationError>of()));
+    private ValidationResult validateType(Class<?> type) {
+        if (!isSafeType(type)) {
+            return validateType(type, new ValidationResult(ImmutableSet.<ValidationError>of()));
+        } else {
+            // safe types do not need to be tested
+            return new ValidationResult(ImmutableSet.<ValidationError>of());
+        }
     }
 
     // performs actual walk down the graph hierarchy within an existing validation process
-    private ValidationResult validateType(Class<?> entity, ValidationResult result) {
-        Class<?> current = entity;
+    private ValidationResult validateType(Class<?> type, ValidationResult result) {
+        Class<?> current = type;
         while (current != null && !current.equals(Object.class)) {
 
             Field[] fields = current.getDeclaredFields();
diff --git a/src/test/java/org/immutizer4j/test/BaseTests.java b/src/test/java/org/immutizer4j/test/BaseTests.java
index 2b4cfb9..615bec1 100644
--- a/src/test/java/org/immutizer4j/test/BaseTests.java
+++ b/src/test/java/org/immutizer4j/test/BaseTests.java
@@ -159,4 +159,14 @@ public void testRegexPatternReference() {
         assertTrue(result.toString(),
                 result.toString().contains("java.util.regex.Pattern$Node.next : NON_FINAL_FIELD"));
     }
+
+    /**
+     * Ensure the base types can be sent as a root message themselves
+     */
+    @Test
+    public void testSafeTypes() {
+        assertEquals(true, defaultImmutizer.getValidationResult(String.class).isValid());
+        assertEquals(true, defaultImmutizer.getValidationResult(Integer.class).isValid());
+        assertEquals(true, defaultImmutizer.getValidationResult(int.class).isValid());
+    }
 }