diff --git a/mlir/include/mlir/Dialect/SPIRV/IR/TargetAndABI.td b/mlir/include/mlir/Dialect/SPIRV/IR/TargetAndABI.td
--- a/mlir/include/mlir/Dialect/SPIRV/IR/TargetAndABI.td
+++ b/mlir/include/mlir/Dialect/SPIRV/IR/TargetAndABI.td
@@ -78,8 +78,7 @@
                     DefaultValuedAttr<I32ElementsAttr, "{128, 128, 64}">>,
 
     // The default number of invocations in each subgroup.
-    // 0x7FFFFFFF means unknown.
-    StructFieldAttr<"subgroup_size", DefaultValuedAttr<I32Attr, "0x7FFFFFFF">>,
+    StructFieldAttr<"subgroup_size", DefaultValuedAttr<I32Attr, "32">>,
 
     // The configurations of cooperative matrix operations
     // supported. Default is an empty list.