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
@@ -677,10 +677,11 @@
                                          ArrayRef<Attribute> values) {
   assert(hasSameElementsOrSplat(type, values));
 
-  // If the element type is not based on int/float/index, assume it is a string
-  // type.
+  // If the element type is an int/float/index or a complex/tensor assume it is
+  // a string type.
   auto eltType = type.getElementType();
-  if (!type.getElementType().isIntOrIndexOrFloat()) {
+  if (!eltType.isIntOrIndexOrFloat() && !eltType.isa<TensorType>() &&
+      !eltType.isa<ComplexType>()) {
     SmallVector<StringRef, 8> stringValues;
     stringValues.reserve(values.size());
     for (Attribute attr : values) {