diff --git a/lib/spack/spack/build_systems/sip.py b/lib/spack/spack/build_systems/sip.py
index b129ca4e0ae..f70daf27242 100644
--- a/lib/spack/spack/build_systems/sip.py
+++ b/lib/spack/spack/build_systems/sip.py
@@ -157,7 +157,7 @@ def configure(self, pkg, spec, prefix):
             ]
         )
 
-        self.python(configure, *args)
+        self.pkg.python(configure, *args)
 
     def configure_args(self):
         """Arguments to pass to configure."""