diff --git a/mlir/lib/Conversion/MemRefToLLVM/MemRefToLLVM.cpp b/mlir/lib/Conversion/MemRefToLLVM/MemRefToLLVM.cpp
--- a/mlir/lib/Conversion/MemRefToLLVM/MemRefToLLVM.cpp
+++ b/mlir/lib/Conversion/MemRefToLLVM/MemRefToLLVM.cpp
@@ -103,9 +103,12 @@
         *getTypeConverter()->getMemRefAddressSpace(allocaOp.getType());
     auto elementPtrType =
         getTypeConverter()->getPointerType(elementType, addrSpace);
+    auto sizeOfElement = getSizeInBytes(loc, elementType, rewriter);
+    auto numElements =
+        rewriter.create<LLVM::UDivOp>(loc, sizeBytes, sizeOfElement);
 
     auto allocatedElementPtr = rewriter.create<LLVM::AllocaOp>(
-        loc, elementPtrType, elementType, sizeBytes,
+        loc, elementPtrType, elementType, numElements,
         allocaOp.getAlignment().value_or(0));
 
     return std::make_tuple(allocatedElementPtr, allocatedElementPtr);