diff --git a/kernels/portable/cpu/op_isinf.cpp b/kernels/portable/cpu/op_isinf.cpp
index 49db65dfcc8..068f402c07d 100644
--- a/kernels/portable/cpu/op_isinf.cpp
+++ b/kernels/portable/cpu/op_isinf.cpp
@@ -15,8 +15,10 @@ namespace executor {
 namespace native {
 
 Tensor& isinf_out(RuntimeContext& ctx, const Tensor& in, Tensor& out) {
+  // Lambda is syntactic sugar needed to workaround compilation on some older
+  // non-compatible distros where isnan is returning int rather than bool
   return internal::unary_ufunc_realhb_to_bool(
-      static_cast<bool (*)(double)>(std::isinf), ctx, in, out);
+      [](double x) -> bool { return std::isinf(x); }, ctx, in, out);
 }
 
 } // namespace native
diff --git a/kernels/portable/cpu/op_isnan.cpp b/kernels/portable/cpu/op_isnan.cpp
index 52857990904..09fb4f5f8ac 100644
--- a/kernels/portable/cpu/op_isnan.cpp
+++ b/kernels/portable/cpu/op_isnan.cpp
@@ -15,8 +15,10 @@ namespace executor {
 namespace native {
 
 Tensor& isnan_out(RuntimeContext& ctx, const Tensor& in, Tensor& out) {
+  // Lambda is syntactic sugar needed to workaround compilation on some older
+  // non-compatible distros where isnan is returning int rather than bool
   return internal::unary_ufunc_realhb_to_bool(
-      static_cast<bool (*)(double)>(std::isnan), ctx, in, out);
+      [](double x) -> bool { return std::isnan(x); }, ctx, in, out);
 }
 
 } // namespace native