1 files changed, 2 insertions, 1 deletions
diff --git a/stmhal/modselect.c b/stmhal/modselect.c
index a84c94554c..ff9df8f5ec 100644
--- a/stmhal/modselect.c
+++ b/stmhal/modselect.c
@@ -26,6 +26,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <errno.h>
 
 #include "stm32f4xx_hal.h"
 
@@ -213,7 +214,7 @@ STATIC mp_obj_t poll_modify(mp_obj_t self_in, mp_obj_t obj_in, mp_obj_t eventmas
     mp_obj_poll_t *self = self_in;
     mp_map_elem_t *elem = mp_map_lookup(&self->poll_map, mp_obj_id(obj_in), MP_MAP_LOOKUP);
     if (elem == NULL) {
-        nlr_raise(mp_obj_new_exception_msg(&mp_type_IOError, "object was never registered"));
+        nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(ENOENT)));
     }
     ((poll_obj_t*)elem->value)->flags = mp_obj_get_int(eventmask_in);
     return mp_const_none;