diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 2545a49bd1f65..87f1e3b02cb8b 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -31,7 +31,7 @@ pref("extensions.logging.enabled", false);
 pref("extensions.strictCompatibility", false);
 
 // Disable compatibility checking due to mish-mash of versions.
-pref("extensions.checkCompatibility.56.1", false);
+pref("extensions.checkCompatibility.56.2", false);
 
 // Specifies a minimum maxVersion an addon needs to say it's compatible with
 // for it to be compatible by default.