diff --git a/implementation-helpers.vicare.sls b/implementation-helpers.vicare.sls
index a4e9a3a..d7791df 100644
--- a/implementation-helpers.vicare.sls
+++ b/implementation-helpers.vicare.sls
@@ -1,3 +1,3 @@
 (library (implementation-helpers)
   (export printf format system pretty-print)
-  (import (only (vicare) printf format system pretty-print)))
+  (import (only (vicare) printf format pretty-print) (only (vicare posix) system)))