diff --git a/crypto/thread/arch/thread_none.c b/crypto/thread/arch/thread_none.c
index 431a9b6a35..c9c047c8e7 100644
--- a/crypto/thread/arch/thread_none.c
+++ b/crypto/thread/arch/thread_none.c
@@ -70,8 +70,4 @@ void ossl_crypto_condvar_free(CRYPTO_CONDVAR **cv)
 {
 }
 
-void ossl_crypto_mem_barrier(void)
-{
-}
-
 #endif
diff --git a/crypto/thread/arch/thread_win.c b/crypto/thread/arch/thread_win.c
index b4c0500936..5bef48458e 100644
--- a/crypto/thread/arch/thread_win.c
+++ b/crypto/thread/arch/thread_win.c
@@ -179,9 +179,4 @@ void ossl_crypto_condvar_free(CRYPTO_CONDVAR **cv)
     *cv_p = NULL;
 }
 
-void ossl_crypto_mem_barrier(void)
-{
-    MemoryBarrier();
-}
-
 #endif
diff --git a/include/internal/thread_arch.h b/include/internal/thread_arch.h
index 171ea2286b..bf00000606 100644
--- a/include/internal/thread_arch.h
+++ b/include/internal/thread_arch.h
@@ -117,6 +117,4 @@ int ossl_crypto_thread_native_exit(void);
 int ossl_crypto_thread_native_is_self(CRYPTO_THREAD *thread);
 int ossl_crypto_thread_native_clean(CRYPTO_THREAD *thread);
 
-void ossl_crypto_mem_barrier(void);
-
 #endif /* OSSL_INTERNAL_THREAD_ARCH_H */