diff --git a/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp b/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
--- a/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
+++ b/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
@@ -122,12 +122,11 @@
 
   Value *MergedVal = nullptr;
   if (auto *StructVal1 = dyn_cast<StructValue>(&Val1)) {
-    auto *StructVal2 = cast<StructValue>(&Val2);
-
     // Values to be merged are always associated with the same location in
     // `LocToVal`. The location stored in `StructVal` should therefore also
     // be the same.
-    assert(&StructVal1->getAggregateLoc() == &StructVal2->getAggregateLoc());
+    assert(&StructVal1->getAggregateLoc() ==
+           &cast<StructValue>(&Val2)->getAggregateLoc());
 
     // `StructVal1` and `StructVal2` may have different properties associated
     // with them. Create a new `StructValue` without any properties so that we