diff --git a/fastlane/Fastfile b/fastlane/Fastfile
index f34e25d443..a4249ac815 100644
--- a/fastlane/Fastfile
+++ b/fastlane/Fastfile
@@ -91,8 +91,8 @@ class Keychain
       unlock: true,
       # Lock it up after 25 minutes just in case we don't delete it.
       timeout: 1500,
-      # To make Fastlane import WWDR certificate into it.
-      default_keychain: true,
+      # Setting a default can cause a race condition with parallel jobs.
+      default_keychain: false,
     )
   end