diff --git a/tests/historical1.json b/tests/historical1.json
index b96812d2d886252dda2a2978a80b607d15682dba..6431839d34c1689f1db7e4be56cee0d0245cb077 100644
--- a/tests/historical1.json
+++ b/tests/historical1.json
@@ -6,6 +6,7 @@
     "rates": {
         "AED": 3.67246,
         "ALL": 144.529793,
-        "ANG": 1.79
+        "ANG": 1.79,
+        "USD": 1
     }
 }