diff --git a/kernels/portable/cpu/op_leaky_relu.cpp b/kernels/portable/cpu/op_leaky_relu.cpp
index 11860c8d129..fa62a75974e 100644
--- a/kernels/portable/cpu/op_leaky_relu.cpp
+++ b/kernels/portable/cpu/op_leaky_relu.cpp
@@ -44,7 +44,11 @@ Tensor& leaky_relu_out(
   ET_KERNEL_CHECK(ctx, in_type == out_type, InvalidArgument, out);
 
   ET_SWITCH_FLOATHBF16_TYPES(in_type, ctx, "leaky_relu.out", CTYPE, [&]() {
-    const CTYPE negative_slope_casted = utils::scalar_to<CTYPE>(negative_slope);
+    auto opt_negative_slope_casted =
+        utils::internal::check_overflow_scalar_cast<CTYPE>(negative_slope);
+    ET_KERNEL_CHECK(
+        ctx, opt_negative_slope_casted.has_value(), InvalidArgument, );
+    auto negative_slope_casted = opt_negative_slope_casted.value();
 
     apply_unary_map_fn(
         [negative_slope_casted](const CTYPE val_in) {
diff --git a/kernels/test/op_leaky_relu_test.cpp b/kernels/test/op_leaky_relu_test.cpp
index 847c00652be..6b2e3083e2e 100644
--- a/kernels/test/op_leaky_relu_test.cpp
+++ b/kernels/test/op_leaky_relu_test.cpp
@@ -40,6 +40,15 @@ class OpLeakyReluTest : public OperatorTest {
     EXPECT_TENSOR_EQ(out, ret);
     EXPECT_TENSOR_EQ(out, tf.ones({2, 2}));
   }
+
+  template <ScalarType DTYPE>
+  void expect_bad_scalar_value_dies(const Scalar& bad_value) {
+    TensorFactory<DTYPE> tf;
+    Tensor in = tf.ones({2, 2});
+    Tensor out = tf.zeros({2, 2});
+
+    ET_EXPECT_KERNEL_FAILURE(context_, op_leaky_relu_out(in, bad_value, out));
+  }
 };
 
 TEST_F(OpLeakyReluTest, SanityCheck) {
@@ -47,3 +56,13 @@ TEST_F(OpLeakyReluTest, SanityCheck) {
   ET_FORALL_FLOATHBF16_TYPES(TEST_ENTRY);
 #undef TEST_ENTRY
 }
+
+TEST_F(OpLeakyReluTest, FloatTensorTooSmallScalarDies) {
+  /* Cannot be represented by a float. */
+  expect_bad_scalar_value_dies<ScalarType::Float>(-3.41e+38);
+}
+
+TEST_F(OpLeakyReluTest, FloatTensorTooLargeScalarDies) {
+  /* Cannot be represented by a float. */
+  expect_bad_scalar_value_dies<ScalarType::Float>(3.41e+38);
+}