diff --git a/lib/index.js b/lib/index.js
index fc41d1a..14e659b 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -41,6 +41,7 @@ var Segment = exports = module.exports = integration('Segment.io')
   .option('crossDomainIdServers', [])
   .option('retryQueue', false)
   .option('addBundledMetadata', false)
+  .option('strictUTM', false)
   .option('unbundledIntegrations', []);
 
 /**
@@ -216,6 +217,10 @@ Segment.prototype.normalize = function(msg) {
       ctx.traits.crossDomainId = crossDomainId;
     }
   }
+
+  // only use strict parsing on new / deliberately enabled
+  utm = this.options.strictUTM ? utm.strict : utm;
+
   // if user provides campaign via context, do not overwrite with UTM qs param
   if (query && !ctx.campaign) {
     ctx.campaign = utm(query);
diff --git a/test/index.test.js b/test/index.test.js
index 308958f..1cd7fff 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -214,7 +214,7 @@ describe('Segment.io', function() {
 
       it('should add .campaign', function() {
         Segment.global = { navigator: {}, location: {} };
-        Segment.global.location.search = '?utm_source=source&utm_medium=medium&utm_term=term&utm_content=content&utm_campaign=name';
+        Segment.global.location.search = '?utm_source=source&utm_medium=medium&utm_term=term&utm_content=content&utm_campaign=name&utm_test=val';
         Segment.global.location.hostname = 'localhost';
         segment.normalize(object);
         analytics.assert(object);
@@ -225,6 +225,7 @@ describe('Segment.io', function() {
         analytics.assert(object.context.campaign.term === 'term');
         analytics.assert(object.context.campaign.content === 'content');
         analytics.assert(object.context.campaign.name === 'name');
+        analytics.assert(object.context.campaign.test === 'val');
         Segment.global = window;
       });
 
@@ -255,6 +256,25 @@ describe('Segment.io', function() {
         Segment.global = window;
       });
 
+      it('should add only specced fields to .campaign if strictmode is enabled', function() {
+        segment.options.strictUTM = true;
+        Segment.global = { navigator: {}, location: {} };
+        Segment.global.location.search = '?utm_source=source&utm_medium=medium&utm_term=term&utm_content=content&utm_campaign=name&utm_test=test&utm_fake=fake';
+        Segment.global.location.hostname = 'localhost';
+        segment.normalize(object);
+        analytics.assert(object);
+        analytics.assert(object.context);
+        analytics.assert(object.context.campaign);
+        analytics.assert(object.context.campaign.source === 'source');
+        analytics.assert(object.context.campaign.medium === 'medium');
+        analytics.assert(object.context.campaign.term === 'term');
+        analytics.assert(object.context.campaign.content === 'content');
+        analytics.assert(object.context.campaign.name === 'name');
+        analytics.assert(object.context.campaign.test === undefined);
+        analytics.assert(object.context.campaign.fake === undefined);
+        Segment.global = window;
+      });
+
       it('should add .referrer.id and .referrer.type', function() {
         Segment.global = { navigator: {}, location: {} };
         Segment.global.location.search = '?utm_source=source&urid=medium';