diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 65f070e..55f7964 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -4225,7 +4225,7 @@
 	SSL_SESSION *sess;
 	struct shared_block *first;
 
-	global.shctx_lookups++;
+	_HA_ATOMIC_ADD(&global.shctx_lookups, 1);
 
 	/* allow the session to be freed automatically by openssl */
 	*do_copy = 0;
@@ -4245,7 +4245,7 @@
 	if (!sh_ssl_sess) {
 		/* no session found: unlock cache and exit */
 		shctx_unlock(ssl_shctx);
-		global.shctx_misses++;
+		_HA_ATOMIC_ADD(&global.shctx_misses, 1);
 		return NULL;
 	}