diff --git a/services/fxaccounts/FxAccounts.jsm b/services/fxaccounts/FxAccounts.jsm
index a4f9a72124a2..4cad40eb381c 100644
--- a/services/fxaccounts/FxAccounts.jsm
+++ b/services/fxaccounts/FxAccounts.jsm
@@ -61,7 +61,7 @@ let publicProperties = [
 // }
 // If the state has changed between the function being called and the promise
 // being resolved, the .resolve() call will actually be rejected.
-AccountState = function(fxaInternal) {
+let AccountState = function(fxaInternal) {
   this.fxaInternal = fxaInternal;
 };