diff --git a/src/core/Bool.pm b/src/core/Bool.pm
index edd8f2508c0..86c2d85116a 100644
--- a/src/core/Bool.pm
+++ b/src/core/Bool.pm
@@ -7,7 +7,7 @@ augment class Bool does Abstraction {
     method Str() { $.perl() }
 
     method Bridge() { self ?? 1.Bridge !! 0.Bridge }
-    method pick(Cool $count = 1, :$replace) {
+    method pick($count = 1, :$replace) {
         (True, False).pick($count, :$replace);
     }
 }