diff --git a/loopy/kernel/creation.py b/loopy/kernel/creation.py
index e4caa7148e7dd5fd352db6e101e45225892da29d..0bf9bb548f7c5f6cf688eea6f1aa4d2bdaba1139 100644
--- a/loopy/kernel/creation.py
+++ b/loopy/kernel/creation.py
@@ -337,6 +337,25 @@ def parse_domains(ctx, domains, defines):
 # }}}
 
 
+# {{{ duplicate arguments with commas in name
+
+def duplicate_args_with_commas(kernel_args):
+    processed_args = []
+    for arg in kernel_args:
+        if arg is Ellipsis or isinstance(arg, str):
+            processed_args.append(arg)
+        else:
+            for arg_name in arg.name.split(","):
+                if not arg_name.strip():
+                    continue
+
+                processed_args.append(arg.copy(name=arg_name))
+
+    return processed_args
+
+# }}}
+
+
 # {{{ guess kernel args (if requested)
 
 class IndexRankFinder(WalkMapper):
@@ -703,24 +722,19 @@ def check_for_reduction_inames_duplication_requests(kernel):
 # }}}
 
 
-# {{{ duplicate arguments and expand defines in shapes
+# {{{ expand defines in shapes
 
-def dup_args_and_expand_defines_in_shapes(kernel, defines):
+def expand_defines_in_shapes(kernel, defines):
     from loopy.kernel.array import ArrayBase
     from loopy.kernel.creation import expand_defines_in_expr
 
     processed_args = []
     for arg in kernel.args:
-        for arg_name in arg.name.split(","):
-            if not arg_name.strip():
-                continue
-
-            new_arg = arg.copy(name=arg_name)
-            if isinstance(arg, ArrayBase):
-                new_arg = new_arg.map_exprs(
-                        lambda expr: expand_defines_in_expr(expr, defines))
+        if isinstance(arg, ArrayBase):
+            arg = arg.map_exprs(
+                    lambda expr: expand_defines_in_expr(expr, defines))
 
-            processed_args.append(new_arg)
+        processed_args.append(arg)
 
     return kernel.copy(args=processed_args)
 
@@ -893,7 +907,8 @@ def make_kernel(device, domains, instructions, kernel_args=["..."], **kwargs):
     domains = parse_domains(isl_context, domains, defines)
 
     kernel_args = guess_kernel_args_if_requested(domains, instructions,
-            kwargs.get("temporary_variables", {}), substitutions, kernel_args,
+            kwargs.get("temporary_variables", {}), substitutions,
+            duplicate_args_with_commas(kernel_args),
             default_offset)
 
     from loopy.kernel import LoopKernel
@@ -905,7 +920,7 @@ def make_kernel(device, domains, instructions, kernel_args=["..."], **kwargs):
     knl = tag_reduction_inames_as_sequential(knl)
     knl = create_temporaries(knl)
     knl = expand_cses(knl)
-    knl = dup_args_and_expand_defines_in_shapes(knl, defines)
+    knl = expand_defines_in_shapes(knl, defines)
     knl = guess_arg_shape_if_requested(knl, default_order)
     knl = apply_default_order_to_args(knl, default_order)