diff --git a/lib/package_version.js b/lib/package_version.js
new file mode 100644
index 00000000..dc9c54da
--- /dev/null
+++ b/lib/package_version.js
@@ -0,0 +1,3 @@
+// This will become package_version_browser.js when doing a browser build.
+// See <https://github.com/Airtable/airtable.js/pull/132> for more.
+module.exports = require('../package.json').version;
diff --git a/lib/package_version_browser.js b/lib/package_version_browser.js
new file mode 100644
index 00000000..8de08b02
--- /dev/null
+++ b/lib/package_version_browser.js
@@ -0,0 +1 @@
+module.exports = process.env.npm_package_version;
diff --git a/lib/run_action.js b/lib/run_action.js
index f349ac03..ea95264f 100644
--- a/lib/run_action.js
+++ b/lib/run_action.js
@@ -2,10 +2,13 @@
 
 var internalConfig = require('./internal_config.json');
 var objectToQueryParamString = require('./object_to_query_param_string');
+var packageVersion = require('./package_version');
 
 // This will become require('xhr') in the browser.
 var request = require('request');
 
+var userAgent = 'Airtable.js/' + packageVersion;
+
 // "Full Jitter" algorithm taken from https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
 function exponentialBackoffWithJitter(numberOfRetries, initialBackoffTimeMs, maxBackoffTimeMs) {
     var rawBackoffTimeMs = initialBackoffTimeMs * Math.pow(2, numberOfRetries);
@@ -22,8 +25,6 @@ function runAction(base, method, path, queryParams, bodyData, callback, numAttem
         'x-api-version': base._airtable._apiVersion,
         'x-airtable-application-id': base.getId(),
     };
-
-    var userAgent = 'Airtable.js/' + process.env.npm_package_version;
     var isBrowser = typeof window !== 'undefined';
     // Some browsers do not allow overriding the user agent.
     // https://github.com/Airtable/airtable.js/issues/52
diff --git a/package.json b/package.json
index 3e685517..6b6b3ed5 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,8 @@
   },
   "main": "./lib/airtable.js",
   "browser": {
-    "request": "xhr"
+    "request": "xhr",
+    "./lib/package_version": "./lib/package_version_browser"
   },
   "files": [
     "/README.md",