diff --git a/bin/cpm b/bin/cpm
--- a/bin/cpm
+++ b/bin/cpm
@@ -2,11 +2,11 @@
 set -eu
 . ~/.lib/sh/stubexec.sh
 
-stubexec $*
+stubexec "$@"
 
 curl -fsSL --compressed https://git.io/cpm |
   perl - install -g App::cpm
 
 plenv rehash || :
 
-stubexec $*
+stubexec "$@"