diff --git a/lib/commands/resolve-spec.js b/lib/commands/resolve-spec.js
index 3c0b8cd6..1cbe6656 100644
--- a/lib/commands/resolve-spec.js
+++ b/lib/commands/resolve-spec.js
@@ -55,7 +55,7 @@ exports.builder = {
   },
   n: {
     alias: 'nullable',
-    describe: 'Should nullable be resolved?',
+    describe: 'Should nullable types be resolved?',
     boolean: true,
     default: false
   },
diff --git a/lib/util/utils.js b/lib/util/utils.js
index a124aa35..a32bfcd8 100644
--- a/lib/util/utils.js
+++ b/lib/util/utils.js
@@ -611,15 +611,14 @@ exports.allowNullType = function allowNullType(entity, isPropRequired) {
       }
     }
 
+    // handling nullable parameters
     let isPropNullable = entity['x-nullable'] && typeof entity['x-nullable'] === 'boolean';
     if ((isPropNullable === undefined && !isPropRequired) || isPropNullable) {
       let savedEntity = entity
       if (savedEntity.in) {
         entity.oneOf = [{ "type": entity.type }, { "type": "null" }];
         delete entity.type
-
-      }
-      else {
+      } else {
         entity = {};
         entity.oneOf = [savedEntity, { "type": "null" }];
       }
diff --git a/lib/validate.js b/lib/validate.js
index af60458f..d4723c49 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -66,6 +66,10 @@ exports.validateSpec = function validateSpec(specPath, options) {
   // validation as that would not match the path parameters defined in the path template
   // and cause the semantic validation to fail.
   options.shouldResolveParameterizedHost = false;
+
+  // We shoudln't be resolving nullable types for semantic validaiton as we'll replace nodes
+  // with oneof arrays which are not semantically valid in swagger 2.0 schema.
+  options.shouldResolveNullableTypes = false;
   let validator = new SpecValidator(specPath, null, options);
   exports.finalValidationResult[specPath] = validator.specValidationResult;
   return validator.initialize().then(function () {
diff --git a/lib/validators/specResolver.js b/lib/validators/specResolver.js
index e0068908..381e80c2 100644
--- a/lib/validators/specResolver.js
+++ b/lib/validators/specResolver.js
@@ -80,19 +80,16 @@ class SpecResolver {
     if (options.shouldResolveDiscriminator === null || options.shouldResolveDiscriminator === undefined) {
       options.shouldResolveDiscriminator = true;
     }
-    if (options.shouldResolveNullableTypes === null || options.shouldResolveNullableTypes === undefined) {
-      options.shouldResolveNullableTypes = true;
-    }
-
     if (options.shouldResolveParameterizedHost === null || options.shouldResolveParameterizedHost === undefined) {
       options.shouldResolveParameterizedHost = true;
     }
-
     // Resolving allOf is a neccessary precondition for resolving discriminators. Hence hard setting this to true
     if (options.shouldResolveDiscriminator) {
       options.shouldResolveAllOf = true;
     }
-
+    if (options.shouldResolveNullableTypes === null || options.shouldResolveNullableTypes === undefined) {
+      options.shouldResolveNullableTypes = true;
+    }
     this.options = options;
   }
 
@@ -163,7 +160,6 @@ class SpecResolver {
       } else {
         return Promise.resolve(self);
       }
-      // }).catch(function (err) {
     }).then(() => {
       if (self.options.shouldResolveNullableTypes) {
         return self.resolveNullableTypes();
diff --git a/lib/validators/specValidator.js b/lib/validators/specValidator.js
index 153420e7..b1aa2267 100644
--- a/lib/validators/specValidator.js
+++ b/lib/validators/specValidator.js
@@ -46,6 +46,8 @@ class SpecValidator {
    * 
    * @param {object} [options.shouldResolveParameterizedHost] Should 'x-ms-parameterized-host' be resolved? Default: true
    * 
+   * @param {object} [options.shouldResolveNullableTypes] Should we allow null values to match any type? Default: true
+   * 
    * @return {object} An instance of the SpecValidator class.
    */
   constructor(specPath, specInJson, options) {