diff --git a/mlir/python/mlir/dialects/_linalg_ops_ext.py b/mlir/python/mlir/dialects/_linalg_ops_ext.py
--- a/mlir/python/mlir/dialects/_linalg_ops_ext.py
+++ b/mlir/python/mlir/dialects/_linalg_ops_ext.py
@@ -74,9 +74,9 @@
       result_type = RankedTensorType.get(sizes, element_type)
       static_size_ints = sizes
 
-    index_type = IndexType.get(context)
+    i64_type = IntegerType.get_signless(64)
     attributes["static_sizes"] = ArrayAttr.get(
-        [IntegerAttr.get(index_type, s) for s in static_size_ints],
+        [IntegerAttr.get(i64_type, s) for s in static_size_ints],
         context=context)
     op = self.build_generic(results=[result_type],
                             operands=operands,
diff --git a/mlir/test/python/dialects/linalg/ops.py b/mlir/test/python/dialects/linalg/ops.py
--- a/mlir/test/python/dialects/linalg/ops.py
+++ b/mlir/test/python/dialects/linalg/ops.py
@@ -38,6 +38,17 @@
 
   print(module)
 
+# CHECK-LABEL: TEST: testInitTensorStaticSizesAttribute
+@run
+def testInitTensorStaticSizesAttribute():
+  with Context() as ctx, Location.unknown():
+    module = Module.create()
+    f32 = F32Type.get()
+    with InsertionPoint(module.body):
+      op = linalg.InitTensorOp([3, 4], f32)
+      # CHECK: [3, 4]
+      print(op.attributes['static_sizes'])
+
 # CHECK-LABEL: TEST: testFill
 @run
 def testFill():
@@ -153,7 +164,7 @@
         # CHECK-NEXT:    std.mulf{{.*}} (f32, f32) -> f32
         # CHECK-NEXT:    std.addf{{.*}} (f32, f32) -> f32
         # CHECK-NEXT:    linalg.yield{{.*}} (f32) -> ()
-        # CHECK-NEXT:    {linalg.memoized_indexing_maps{{.*}}operand_segment_sizes = dense<[2, 1]> : vector<2xi32>} : 
+        # CHECK-NEXT:    {linalg.memoized_indexing_maps{{.*}}operand_segment_sizes = dense<[2, 1]> : vector<2xi32>} :
         # CHECK-SAME: (tensor<4x16xf32>, tensor<16x8xf32>, tensor<4x8xf32>) -> tensor<4x8xf32>
         return linalg.matmul(lhs, rhs, outs=[init_result.result])