diff --git a/src/common/compat.c b/src/common/compat.c
index 7fe97488e3aad136428a758c13741cc173012678..97eab94e04e74248adbbe04a4241fd8cf8a4321f 100644
--- a/src/common/compat.c
+++ b/src/common/compat.c
@@ -1186,7 +1186,7 @@ mark_socket_open(tor_socket_t s)
   bitarray_set(open_sockets, s);
 }
 #else /* !(defined(DEBUG_SOCKET_COUNTING)) */
-#define mark_socket_open(s) STMT_NIL
+#define mark_socket_open(s) ((void) (s))
 #endif /* defined(DEBUG_SOCKET_COUNTING) */
 /** @} */