diff --git a/src/core/IO/Spec/Cygwin.pm b/src/core/IO/Spec/Cygwin.pm
index ea63a012747..0f017e334e7 100644
--- a/src/core/IO/Spec/Cygwin.pm
+++ b/src/core/IO/Spec/Cygwin.pm
@@ -1,6 +1,6 @@
 my class IO::Spec::Cygwin is IO::Spec::Unix {
 
-    method canonpath (Cool:D $patharg, :$parent) {
+    method canonpath ($patharg, :$parent) {
         my $path = $patharg.Str;
         $path.=subst(:g, '\\', '/');