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
@@ -1316,8 +1316,11 @@
   if (eltType.isa<FloatType>())
     return FloatAttr::get(eltType, 0);
 
+  // Handle string type.
+  if (auto denseAttr = getValues().dyn_cast<DenseStringElementsAttr>())
+    return StringAttr::get("", eltType);
+
   // Otherwise, this is an integer.
-  // TODO: Handle StringAttr here.
   return IntegerAttr::get(eltType, 0);
 }