diff --git a/lib/IRGen/LoadableByAddress.cpp b/lib/IRGen/LoadableByAddress.cpp
index f7c24f0ff230a..f9eda93f7b0a9 100644
--- a/lib/IRGen/LoadableByAddress.cpp
+++ b/lib/IRGen/LoadableByAddress.cpp
@@ -3798,6 +3798,15 @@ class AssignAddressToDef : SILInstructionVisitor<AssignAddressToDef> {
     assignment.mapValueToAddress(origValue, newAddr);
     assignment.markForDeletion(bc);
   }
+
+  void visitUncheckedBitwiseCastInst(UncheckedBitwiseCastInst *bc) {
+    auto builder = assignment.getBuilder(bc->getIterator());
+    auto opdAddr = assignment.getAddressForValue(bc->getOperand());
+    auto newAddr = builder.createUncheckedAddrCast(
+        bc->getLoc(), opdAddr, bc->getType().getAddressType());
+    assignment.mapValueToAddress(origValue, newAddr);
+    assignment.markForDeletion(bc);
+  }
 };
 } // namespace