diff --git a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index fd10f23dec5b1..f53f3eb8da754 100644
--- a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -920,7 +920,7 @@ bool MemCpyOptPass::performCallSlotOptzn(Instruction *cpyLoad,
   // trap.  Otherwise the transform is invalid since it might cause a trap
   // to occur earlier than it otherwise would.
   if (!isDereferenceableAndAlignedPointer(cpyDest, Align(1), APInt(64, cpySize),
-                                          DL, C, nullptr, DT)) {
+                                          DL, C, AC, DT)) {
     LLVM_DEBUG(dbgs() << "Call Slot: Dest pointer not dereferenceable\n");
     return false;
   }