diff --git a/src/core/Enumeration.pm6 b/src/core/Enumeration.pm6
index 589abf8bd8a..559a68d74d6 100644
--- a/src/core/Enumeration.pm6
+++ b/src/core/Enumeration.pm6
@@ -2,7 +2,7 @@
 my role Enumeration {
     has $.key;
     has $.value;
-    has Int $!index;
+    has int $!index;
 
     method enums() { self.^enum_values.Map }