diff --git a/src/modules/json.c b/src/modules/json.c
index fe2450d0..61e3c8d3 100644
--- a/src/modules/json.c
+++ b/src/modules/json.c
@@ -26,9 +26,9 @@ void pk__add_module_json() {
     py_setdict(mod, py_name("false"), py_False());
     py_TValue tmp;
     py_newfloat(&tmp, NAN);
-    py_setdict(mod, "NaN", &tmp);
+    py_setdict(mod, py_name("NaN"), &tmp);
     py_newfloat(&tmp, INFINITY);
-    py_setdict(mod, "Infinity", &tmp);
+    py_setdict(mod, py_name("Infinity"), &tmp);
 
     py_bindfunc(mod, "loads", json_loads);
     py_bindfunc(mod, "dumps", json_dumps);