diff --git a/src/BotDriver.js b/src/BotDriver.js
index f6a01df7..e0c8bbab 100644
--- a/src/BotDriver.js
+++ b/src/BotDriver.js
@@ -241,8 +241,8 @@ module.exports = class BotDriver {
         if (_.isString(newCaps[capKey])) {
           try {
             caps[capKey] = JSON.parse(newCaps[capKey])
-            if (_.isFinite(caps[capKey])) {
-              caps[capKey] = caps[capKey].toString()
+            if (_.isFinite(Number(newCaps[capKey]))) {
+              caps[capKey] = newCaps[capKey].toString()
             }
           } catch (err) {
             caps[capKey] = newCaps[capKey]
diff --git a/test/driver/capabilities.spec.js b/test/driver/capabilities.spec.js
index 60c2d92d..52827ddb 100644
--- a/test/driver/capabilities.spec.js
+++ b/test/driver/capabilities.spec.js
@@ -75,6 +75,15 @@ describe('driver.capabilities', function () {
       assert.isString(driver.caps.CAP_STRING_1)
       assert.isString(driver.caps.CAP_STRING_2)
     })
+    it('should merge string caps when there are numbers', function () {
+      const myCaps = {
+        CAP_STRING_1: 'Test',
+        CAP_STRING_2: '1234567892343434344'
+      }
+      const driver = new BotDriver(myCaps)
+      assert.strictEqual(driver.caps.CAP_STRING_1, myCaps.CAP_STRING_1)
+      assert.strictEqual(driver.caps.CAP_STRING_2, myCaps.CAP_STRING_2)
+    })
     it('should merge boolean envs', function () {
       process.env.BOTIUM_SIMPLEREST_PING_PROCESS_RESPONSE = 'NO'
       const driver = new BotDriver()