diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 5356637..93ccfc6 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -2493,6 +2493,10 @@
   // We arrive here if we have found an implementation, and it is not in the ImtConflictTable.
   // We create a new table with the new pair { interface_method, method }.
   DCHECK(conflict_method->IsRuntimeMethod());
+
+  // Classes in the boot image should never need to update conflict methods in
+  // their IMT.
+  CHECK(!Runtime::Current()->GetHeap()->ObjectIsInBootImageSpace(cls.Get()));
   ArtMethod* new_conflict_method = Runtime::Current()->GetClassLinker()->AddMethodToConflictTable(
       cls.Get(),
       conflict_method,
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
index 363fe25..1962ba2 100644
--- a/runtime/jit/jit.cc
+++ b/runtime/jit/jit.cc
@@ -1021,6 +1021,10 @@
     // such methods, we need their entrypoints to be stubs that do the
     // initialization check.
     header.VisitPackedArtMethods([&](ArtMethod& method) NO_THREAD_SAFETY_ANALYSIS {
+      // Methods in the boot image should never have their single
+      // implementation flag set (and therefore never have a `data_` pointing
+      // to an ArtMethod for single implementation).
+      CHECK(method.IsIntrinsic() || !method.HasSingleImplementationFlag());
       if (method.IsRuntimeMethod()) {
         return;
       }