diff --git a/mlir/lib/IR/BuiltinAttributes.cpp b/mlir/lib/IR/BuiltinAttributes.cpp
--- a/mlir/lib/IR/BuiltinAttributes.cpp
+++ b/mlir/lib/IR/BuiltinAttributes.cpp
@@ -696,8 +696,8 @@
   size_t storageBitWidth = getDenseElementStorageWidth(bitWidth);
 
   // Compress the attribute values into a character buffer.
-  SmallVector<char, 8> data(llvm::divideCeil(storageBitWidth, CHAR_BIT) *
-                            values.size());
+  SmallVector<char, 8> data(llvm::divideCeil(storageBitWidth * values.size(),
+                            CHAR_BIT));
   APInt intVal;
   for (unsigned i = 0, e = values.size(); i < e; ++i) {
     assert(eltType == values[i].getType() &&