diff --git a/plugins/python-build/bin/python-build b/plugins/python-build/bin/python-build
index 749fa641..e76ac01c 100755
--- a/plugins/python-build/bin/python-build
+++ b/plugins/python-build/bin/python-build
@@ -1585,8 +1585,10 @@ use_freebsd_pkg() {
 has_broken_mac_readline() {
   # Mac OS X 10.4 has broken readline.
   # https://github.com/pyenv/pyenv/issues/23
-  is_mac || return 1
-  ! configured_with_package_dir "python" "readline/rlconf.h" || return 1
+  if ! is_mac || configured_with_package_dir "python" "readline/rlconf.h"; then
+    # Not applicable.
+    return 1
+  fi
   if can_use_homebrew; then
     use_homebrew_readline && return 1
   fi