diff --git a/gson/src/main/java/com/google/gson/JsonPrimitive.java b/gson/src/main/java/com/google/gson/JsonPrimitive.java
index 029ab5b7..b12224bb 100644
--- a/gson/src/main/java/com/google/gson/JsonPrimitive.java
+++ b/gson/src/main/java/com/google/gson/JsonPrimitive.java
@@ -28,6 +28,10 @@ import java.math.BigInteger;
  */
 public final class JsonPrimitive extends JsonElement {
 
+  private static final Class<?>[] PRIMITIVE_TYPES = { int.class, long.class, short.class,
+      float.class, double.class, byte.class, boolean.class, char.class, Integer.class, Long.class,
+      Short.class, Float.class, Double.class, Byte.class, Boolean.class, Character.class };
+
   private Object value;
 
   /**
@@ -95,7 +99,7 @@ public final class JsonPrimitive extends JsonElement {
       this.value = String.valueOf(c);
     } else {
       Preconditions.checkArgument(primitive instanceof Number
-          || ObjectNavigator.isPrimitiveOrString(primitive));
+          || isPrimitiveOrString(primitive));
       this.value = primitive;
     }
   }
@@ -317,4 +321,18 @@ public final class JsonPrimitive extends JsonElement {
       }
     }
   }
+  
+  private static boolean isPrimitiveOrString(Object target) {
+    if (target instanceof String) {
+      return true;
+    }
+
+    Class<?> classOfPrimitive = target.getClass();
+    for (Class<?> standardPrimitive : PRIMITIVE_TYPES) {
+      if (standardPrimitive.isAssignableFrom(classOfPrimitive)) {
+        return true;
+      }
+    }
+    return false;
+  }
 }
diff --git a/gson/src/main/java/com/google/gson/ObjectNavigator.java b/gson/src/main/java/com/google/gson/ObjectNavigator.java
index 2f291641..fccafe8a 100644
--- a/gson/src/main/java/com/google/gson/ObjectNavigator.java
+++ b/gson/src/main/java/com/google/gson/ObjectNavigator.java
@@ -150,23 +150,4 @@ final class ObjectNavigator {
       }
     }
   }
-
-  @SuppressWarnings("unchecked")
-  private static final Class[] PRIMITIVE_TYPES = { int.class, long.class, short.class, float.class,
-      double.class, byte.class, boolean.class, Integer.class, Long.class, Short.class, Float.class,
-      Double.class, Byte.class, Boolean.class };
-
-  @SuppressWarnings("unchecked")
-  static boolean isPrimitiveOrString(Object target) {
-    if (target instanceof String) {
-      return true;
-    }
-    Class<?> classOfPrimitive = target.getClass();
-    for (Class standardPrimitive : PRIMITIVE_TYPES) {
-      if (standardPrimitive.isAssignableFrom(classOfPrimitive)) {
-        return true;
-      }
-    }
-    return false;
-  }
 }