diff --git a/loopy/check.py b/loopy/check.py
index 0390618181b70129ba0395218f9dd40f2cad803a..4e0382abea19c33fe1ff1ea043f531dec698e8c1 100644
--- a/loopy/check.py
+++ b/loopy/check.py
@@ -515,6 +515,9 @@ def check_that_temporaries_are_defined_in_subkernels_where_used(kernel):
                 insn_query.temporaries_read_in_subkernel(subkernel) -
                 insn_query.temporaries_written_in_subkernel(subkernel)):
 
+            if temporary.initializer is not None:
+                continue
+
             if kernel.temporary_variables[temporary].scope in (
                     temp_var_scope.PRIVATE, temp_var_scope.LOCAL):
                 from loopy.diagnostic import MissingDefinitionError
@@ -528,20 +531,25 @@ def check_that_temporaries_are_defined_in_subkernels_where_used(kernel):
 # {{{ check that all instructions are scheduled
 
 def check_that_all_insns_are_scheduled(kernel):
-    all_insns = set(insn.id for insn in kernel.instructions)
+    from loopy.kernel.instruction import NoOpInstruction
+
+    all_schedulable_insns = set(
+        insn.id for insn in kernel.instructions
+        # nops are not schedulable
+        if not isinstance(insn, NoOpInstruction))
     from loopy.schedule import sched_item_to_insn_id
     scheduled_insns = set(
         insn_id
         for sched_item in kernel.schedule
         for insn_id in sched_item_to_insn_id(sched_item))
 
-    assert scheduled_insns <= all_insns
+    assert scheduled_insns <= all_schedulable_insns
 
-    if scheduled_insns < all_insns:
+    if scheduled_insns < all_schedulable_insns:
         from loopy.diagnostic import UnscheduledInstructionError
         raise UnscheduledInstructionError(
             "unscheduled instructions: '%s'"
-            % ', '.join(all_insns - scheduled_insns))
+            % ', '.join(all_schedulable_insns - scheduled_insns))
 
 # }}}