diff --git a/sycl/include/CL/sycl/detail/pi.hpp b/sycl/include/CL/sycl/detail/pi.hpp
index 5bddf65c8cc2e..b63072b67decf 100644
--- a/sycl/include/CL/sycl/detail/pi.hpp
+++ b/sycl/include/CL/sycl/detail/pi.hpp
@@ -424,6 +424,8 @@ template <class To, class From> inline To cast(From value) {
 }
 
 template <class To, class From> inline To cast(std::vector<From> value) {
+  // Silence the unused parameter warning.
+  (void)value;
   RT::assertion(false,
                 "Compatibility specialization, not expected to be used. "
                 "The only allowed cast using a vector of From values is "