diff --git a/unix/defs.lisp b/unix/defs.lisp
index dd7fa5c..1cf7d07 100644
--- a/unix/defs.lisp
+++ b/unix/defs.lisp
@@ -134,4 +134,4 @@
(define-resource-class pkg)
-(defgeneric probe-installed-packages% (host os))
+(defgeneric probe-installed-packages (host os))