diff --git a/include/boost/atomic/detail/ops_msvc_arm.hpp b/include/boost/atomic/detail/ops_msvc_arm.hpp
index 65056d2..349f7a5 100644
--- a/include/boost/atomic/detail/ops_msvc_arm.hpp
+++ b/include/boost/atomic/detail/ops_msvc_arm.hpp
@@ -798,7 +798,7 @@ BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
     BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
 }
 
-BOOST_FORCEINLINE void signal_fence(memory_order) BOOST_NOEXCEPT
+BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
 {
     if (order != memory_order_relaxed)
         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
diff --git a/include/boost/atomic/detail/ops_windows.hpp b/include/boost/atomic/detail/ops_windows.hpp
index 85e21e6..d3de63b 100644
--- a/include/boost/atomic/detail/ops_windows.hpp
+++ b/include/boost/atomic/detail/ops_windows.hpp
@@ -202,7 +202,7 @@ BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
     BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();
 }
 
-BOOST_FORCEINLINE void signal_fence(memory_order) BOOST_NOEXCEPT
+BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
 {
     if (order != memory_order_relaxed)
         BOOST_ATOMIC_DETAIL_COMPILER_BARRIER();