diff --git a/loopy/codegen/expression.py b/loopy/codegen/expression.py
index 5bcc56228f34ca2d86b7038700dff45fca414764..e4a512957e5cafdb310552399f53b3b8f4274b07 100644
--- a/loopy/codegen/expression.py
+++ b/loopy/codegen/expression.py
@@ -425,9 +425,7 @@ class LoopyCCodeMapper(RecursiveMapper):
         domain = self.kernel.get_inames_domain(iname_deps)
 
         assumption_non_param = isl.BasicSet.from_params(self.kernel.assumptions)
-        assumptions = isl.align_spaces(
-                assumption_non_param,
-                domain, obj_bigger_ok=True)
+        assumptions, domain = isl.align_two(assumption_non_param, domain)
         domain = domain & assumptions
 
         from loopy.isl_helpers import is_nonnegative