diff --git a/lib/types/api.js b/lib/types/api.js
index dca973f7..c8838ca6 100644
--- a/lib/types/api.js
+++ b/lib/types/api.js
@@ -102,13 +102,19 @@ function SwaggerApi (definition, definitionRemotesResolved, definitionFullyResol
   debug('  Paths:');
 
   // Create the Path objects
-  this.pathObjects = _.map(definitionFullyResolved.paths, function (pathDef, path) {
-    return new Path(that,
-                    path,
-                    _.get(definitionRemotesResolved, ['paths', path]),
-                    pathDef,
-                    ['paths', path]);
-  });
+  this.pathObjects = _.reduce(definitionFullyResolved.paths, function (result, pathDef, path) {
+    // Filter out extensions
+    if (path.indexOf('x-') === 0) {
+      return result;
+    }
+    result.push(new Path(
+      that,
+      path,
+      _.get(definitionRemotesResolved, ['paths', path]),
+      pathDef,
+      ['paths', path]));
+    return result;
+  }, []);
 }
 
 /**
diff --git a/lib/types/operation.js b/lib/types/operation.js
index 646b53f0..2f63a707 100644
--- a/lib/types/operation.js
+++ b/lib/types/operation.js
@@ -120,15 +120,20 @@ function Operation (pathObject, method, definition, definitionFullyResolved, pat
   this._debug('          Responses:');
 
   // Create response objects from responses defined in the operation definition
-  this.responseObjects = _.map(this.definitionFullyResolved.responses, function (responseDef, code) {
+  this.responseObjects = _.reduce(this.definitionFullyResolved.responses, function (result, responseDef, code) {
+    // Filter out extensions
+    if (code.indexOf('x-') === 0) {
+      return result;
+    }
     var rPath = pathToDefinition.concat(['responses', code])
 
-    return new Response(that,
-                        code,
-                        _.get(that.pathObject.api.definitionRemotesResolved, rPath),
-                        responseDef,
-                        rPath);
-  });
+    result.push(new Response(that,
+      code,
+      _.get(that.pathObject.api.definitionRemotesResolved, rPath),
+      responseDef,
+      rPath));
+    return result;
+  }, []);
 
   this._debug('          Security:');
 
diff --git a/lib/validation/validators.js b/lib/validation/validators.js
index 5d3eacc2..738da3d5 100644
--- a/lib/validation/validators.js
+++ b/lib/validation/validators.js
@@ -321,7 +321,9 @@ function validateReferences (api) {
     referenceable.push(JsonRefs.pathToPtr(['parameters', name]));
   });
 
-  _.forEach(api.definitionFullyResolved.responses, function (def, name) {
+  var responses = stripExtensions(api.definitionFullyResolved.responses);
+
+  _.forEach(responses, function (def, name) {
     referenceable.push(JsonRefs.pathToPtr(['responses', name]));
   });
 
@@ -397,7 +399,9 @@ function validateReferences (api) {
   // Identify references and validate missing references for non-JSON References (security)
   _.forEach(api.definitionFullyResolved.security, createSecurityProcessor(['security']));
 
-  _.forEach(api.definitionFullyResolved.paths, function (pathDef, name) {
+  var pathObjects = stripExtensions(api.definitionFullyResolved.paths);
+
+  _.forEach(pathObjects, function (pathDef, name) {
     var pPath = ['paths', name];
 
     _.forEach(pathDef.security, createSecurityProcessor(pPath.concat('security')));
@@ -425,6 +429,25 @@ function validateReferences (api) {
   return response;
 }
 
+/**
+ * Returns a new object with removed extension properties.
+ * This is important for paths and responses where every item in each of these
+ * collections are treated as individual paths or responses. Extensions should be
+ * ignored when iterating these items.
+ * @param {object} collection collection with extensions
+ * @returns {object} collection with stripped extensions
+ */
+function stripExtensions (collection) {
+  return _.reduce(collection, function (result, def, name) {
+    // Filter out extensions
+    if (name.indexOf('x-') === 0) {
+      return result;
+    }
+    result[name] = def;
+    return result;
+  }, {});
+}
+
 /**
  * Validates all schema objects and schema-like objects (non-body path parameters).
  *
@@ -476,6 +499,9 @@ function validateSchemaObjects (api) {
   }
 
   function validateResponses (responses, path) {
+
+    responses = stripExtensions(responses);
+
     _.forEach(responses, function (responseDef, name) {
       var rPath = path.concat(name);
 
@@ -501,7 +527,9 @@ function validateSchemaObjects (api) {
   validateResponses(api.definitionFullyResolved.responses, ['responses']);
 
   // Validate paths and operations
-  _.forEach(api.definitionFullyResolved.paths, function (pathDef, path) {
+  var pathObjects = stripExtensions(api.definitionFullyResolved.paths);
+
+  _.forEach(pathObjects, function (pathDef, path) {
     var pPath = ['paths', path];
 
     // Validate path-level parameter definitions
@@ -565,7 +593,9 @@ function validatePathsAndOperations (api) {
     return seenParameters;
   }
 
-  _.reduce(api.definitionFullyResolved.paths, function (metadata, pathDef, path) {
+  var pathObjects = stripExtensions(api.definitionFullyResolved.paths);
+
+  _.reduce(pathObjects, function (metadata, pathDef, path) {
     var declaredPathParameters = [];
     var normalizedPath = path;
     var pPath = ['paths', path];
diff --git a/test/browser/documents/2.0/swagger.yaml b/test/browser/documents/2.0/swagger.yaml
index afa959ba..a5aabc7b 100644
--- a/test/browser/documents/2.0/swagger.yaml
+++ b/test/browser/documents/2.0/swagger.yaml
@@ -31,6 +31,10 @@ tags:
 schemes:
 - "http"
 paths:
+  x-an-extension-null:
+  x-an-extension-primitive: 1
+  x-an-extension-array: []
+  x-an-extension-object: {}
   /pet:
     post:
       tags:
@@ -52,6 +56,10 @@ paths:
         schema:
           $ref: "#/definitions/Pet"
       responses:
+        x-an-extension-null:
+        x-an-extension-primitive: 1
+        x-an-extension-array: []
+        x-an-extension-object: {}
         405:
           description: "Invalid input"
     put:
diff --git a/test/test-api.js b/test/test-api.js
index cfdaa1f2..aba2b5a2 100644
--- a/test/test-api.js
+++ b/test/test-api.js
@@ -344,8 +344,12 @@ function runTests (mode) {
     });
 
     describe('#getPaths', function () {
-      it('should return the expected path objects', function () {
-        assert.equal(swaggerApi.getPaths().length, Object.keys(swaggerApi.definitionFullyResolved.paths).length);
+      it('should return the expected path objects without extensions', function () {
+        var paths = Object.keys(swaggerApi.definitionFullyResolved.paths).filter(function (path) {
+          return path.indexOf('x-') !== 0;
+        });
+
+        assert.equal(swaggerApi.getPaths().length, paths.length);
       });
     });