diff --git a/py/compile.c b/py/compile.c
index e00af60..797d7a9 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -293,7 +293,9 @@
                         // pass
                     } else if (MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_PERCENT)) {
                         // int%int
-                        pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, mp_small_int_modulo(arg0, arg1));
+                        if (arg1 != 0) {
+                            pn = mp_parse_node_new_leaf(MP_PARSE_NODE_SMALL_INT, mp_small_int_modulo(arg0, arg1));
+                        }
                     } else {
                         assert(MP_PARSE_NODE_IS_TOKEN_KIND(pns->nodes[1], MP_TOKEN_OP_DBL_SLASH)); // should be
                         if (arg1 != 0) {