diff --git a/kitty/fonts.c b/kitty/fonts.c
index 68f0ed19f..df4fbd6db 100644
--- a/kitty/fonts.c
+++ b/kitty/fonts.c
@@ -359,7 +359,7 @@ test_sprite_position_for(PyObject UNUSED *self, PyObject *args) {
     int error;
     SpritePosition *pos = sprite_position_for(&box_font, glyph, extra_glyphs, false, &error);
     if (pos == NULL) { sprite_map_set_error(error); return NULL; }
-    return Py_BuildValue("III", pos->x, pos->y, pos->z);
+    return Py_BuildValue("HHH", pos->x, pos->y, pos->z);
 }
 
 static PyMethodDef module_methods[] = {