diff --git a/.travis.yml b/.travis.yml
index 04d6dd9..a008924 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,6 @@
 language: node_js
+before_install:
+  - curl --location http://git.io/1OcIZA | bash -s
 node_js:
   - "0.8"
   - "0.10"
diff --git a/lib/revalidator.js b/lib/revalidator.js
index 0c0160f..c200661 100644
--- a/lib/revalidator.js
+++ b/lib/revalidator.js
@@ -251,6 +251,9 @@
     if (value === undefined) {
       if (schema.required && schema.type !== 'any') {
         return error('required', property, undefined, schema, errors);
+      } else if (schema.default !== undefined) {
+        object[property] = schema.default;
+        return;
       } else {
         return;
       }
@@ -275,7 +278,7 @@
       }
     }
 
-    if (schema.format && options.validateFormats) {
+    if (schema.format && options.validateFormats && !(value === null && schema.type.indexOf('null') !== -1)) {
       format = schema.format;
 
       if (options.validateFormatExtensions) { spec = validate.formatExtensions[format] }
@@ -293,7 +296,10 @@
     }
 
     if (schema['enum'] && schema['enum'].indexOf(value) === -1) {
-      error('enum', property, value, schema, errors);
+      // Support allowEmpty and allow null if it's in the types (issue #84)
+      if (!(schema.type.indexOf('string') !== -1 && schema.allowEmpty && value === '') &&
+          !(schema.type.indexOf('null') !== -1 && value === null))
+        error('enum', property, value, schema, errors);
     }
 
     // Dependencies (see 5.8)