diff --git a/plugins/python-build/bin/python-build b/plugins/python-build/bin/python-build
index a5dd3e6a..e76ac01c 100755
--- a/plugins/python-build/bin/python-build
+++ b/plugins/python-build/bin/python-build
@@ -1585,13 +1585,15 @@ use_freebsd_pkg() {
 has_broken_mac_readline() {
   # Mac OS X 10.4 has broken readline.
   # https://github.com/pyenv/pyenv/issues/23
-  if is_mac && ! configured_with_package_dir "python" "readline/rlconf.h"; then
-    if can_use_homebrew; then
-      use_homebrew_readline && return 1
-    fi
-    if can_use_macports; then
-      use_macports_readline && return 1
-    fi
+  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
+  if can_use_macports; then
+    use_macports_readline && return 1
   fi
 }