diff --git a/test/number_format_test.dart b/test/number_format_test.dart
index 91ddab2..77ddb8c 100644
--- a/test/number_format_test.dart
+++ b/test/number_format_test.dart
@@ -45,8 +45,8 @@
 
 /// Test numbers that won't work in Javascript because they're too big.
 var testNumbersOnlyForTheVM = {
-  "10,000,000,000,000,000,000,000,000,000,000":
-      10000000000000000000000000000000,
+  "9,000,000,000,000,000,000":
+      9000000000000000000,
 };
 
 get allTestNumbers => new Map.from(testNumbersWeCanReadBack)