diff --git a/Formula/weboob.rb b/Formula/weboob.rb
index 5273899411..fbe844d228 100644
--- a/Formula/weboob.rb
+++ b/Formula/weboob.rb
@@ -111,7 +111,7 @@ class Weboob < Formula
 
     resource("Pillow").stage do
       inreplace "setup.py" do |s|
-        sdkprefix = MacOS::CLT.installed? ? "" : MacOS.sdk_path
+        sdkprefix = MacOS.sdk_path_if_needed ? MacOS.sdk_path : ""
         s.gsub! "openjpeg.h", "probably_not_a_header_called_this_eh.h"
         s.gsub! "ZLIB_ROOT = None", "ZLIB_ROOT = ('#{sdkprefix}/usr/lib', '#{sdkprefix}/usr/include')"
         s.gsub! "JPEG_ROOT = None", "JPEG_ROOT = ('#{Formula["jpeg"].opt_prefix}/lib', '#{Formula["jpeg"].opt_prefix}/include')"