diff --git a/library/threading.c b/library/threading.c
index 83ec01a..b0cebd1 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -113,6 +113,9 @@
 
     mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
     mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
+#if defined(MBEDTLS_ECP_FUNCTION_ALT)
+    mbedtls_mutex_init( &mbedtls_threading_cryptohw_asym_mutex );
+#endif
 }
 
 /*
@@ -122,6 +125,9 @@
 {
     mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
     mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
+#if defined(MBEDTLS_ECP_FUNCTION_ALT)
+    mbedtls_mutex_free( &mbedtls_threading_cryptohw_asym_mutex );
+#endif
 }
 #endif /* MBEDTLS_THREADING_ALT */
 
@@ -133,5 +139,8 @@
 #endif
 mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
 mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
+#if defined(MBEDTLS_ECP_FUNCTION_ALT)
+mbedtls_threading_mutex_t mbedtls_threading_cryptohw_asym_mutex MUTEX_INIT;
+#endif
 
 #endif /* MBEDTLS_THREADING_C */