diff --git a/lodash.js b/lodash.js
index 8df06c244..109398f13 100644
--- a/lodash.js
+++ b/lodash.js
@@ -221,6 +221,7 @@
     rsUpper + '?' + rsLower + '+(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
     rsUpperMisc + '+(?=' + [rsBreak, rsUpper + rsLowerMisc, '$'].join('|') + ')',
     rsUpper + '?' + rsLowerMisc + '+',
+    rsUpper + '+',
     rsDigits + '(?:' + rsLowerMisc + '+)?',
     rsEmoji
   ].join('|'), 'g');
diff --git a/test/test.js b/test/test.js
index 04ae0a565..c2683a4ad 100644
--- a/test/test.js
+++ b/test/test.js
@@ -22144,10 +22144,11 @@
     });
 
     QUnit.test('should work with compound words', function(assert) {
-      assert.expect(7);
+      assert.expect(8);
 
       assert.deepEqual(_.words('12Feet'), ['12', 'Feet']);
       assert.deepEqual(_.words('enable 24h format'), ['enable', '24h', 'format']);
+      assert.deepEqual(_.words('isISO8601'), ['is', 'ISO', '8601']);
       assert.deepEqual(_.words('tooLegit2Quit'), ['too', 'Legit', '2', 'Quit']);
       assert.deepEqual(_.words('walk500Miles'), ['walk', '500', 'Miles']);
       assert.deepEqual(_.words('xhr2Request'), ['xhr', '2', 'Request']);