diff --git a/mlir/lib/Dialect/Tosa/Transforms/TosaValidation.cpp b/mlir/lib/Dialect/Tosa/Transforms/TosaValidation.cpp
index e390a613b580773..93e8cac6b84e9c1 100644
--- a/mlir/lib/Dialect/Tosa/Transforms/TosaValidation.cpp
+++ b/mlir/lib/Dialect/Tosa/Transforms/TosaValidation.cpp
@@ -543,7 +543,6 @@ bool TosaValidation::isValidElementType(Type type) {
       case 16:
       case 32:
       case 48:
-      case 64:
         return true;
       default:
         return false;
diff --git a/mlir/test/Dialect/Tosa/invalid.mlir b/mlir/test/Dialect/Tosa/invalid.mlir
index f1b1707a0c40d90..c7a1e9b87709145 100644
--- a/mlir/test/Dialect/Tosa/invalid.mlir
+++ b/mlir/test/Dialect/Tosa/invalid.mlir
@@ -618,3 +618,13 @@ func.func @test_mul_invalid_shift(%arg0: tensor<13x21x3xf32>, %arg1: tensor<13x1
   %0 = tosa.mul %arg0, %arg1 {shift = 1 : i8} : (tensor<13x21x3xf32>, tensor<13x1x3xf32>) -> tensor<13x21x3xf32>
   return %0 : tensor<13x21x3xf32>
 }
+
+// -----
+
+// CHECK-LABEL: test_unsupported_int64_data_type
+func.func @test_unsupported_int64_data_type(%arg0: tensor<1x13x13x5xf32>) -> tensor<1x13x13xi64> {
+  // expected-error@+1 {{'tosa.argmax' op is not profile-aligned: element type 'i64' is not legal}}
+  %0 = tosa.argmax %arg0 {axis = 3 : i32} : (tensor<1x13x13x5xf32>) -> tensor<1x13x13xi64>
+  // expected-error@+1 {{'func.return' op is not profile-aligned: element type 'i64' is not legal}}
+  return %0 : tensor<1x13x13xi64>
+}