diff --git a/probes.lisp b/probes.lisp
index a10aa26..54aef29 100644
--- a/probes.lisp
+++ b/probes.lisp
@@ -21,9 +21,9 @@
  service
  (command-return-code
   #+openbsd
-  (list "rcctl" "check" (getf params :name))
+  (list "/usr/sbin/rcctl" "check" (getf params :name))
   #+(or freebsd linux)
-  (list "service" (getf params :name) "status")))
+  (list "/usr/sbin/service" (getf params :name) "status")))
 
 (create-probe
  pid-running