diff --git a/src/p_mobj.h b/src/p_mobj.h
index 8811c0149..0f163236b 100644
--- a/src/p_mobj.h
+++ b/src/p_mobj.h
@@ -275,14 +275,17 @@ struct mobj_t
 	// List: thinker links.
 	thinker_t thinker;
 
-	mobjtype_t type;
-	const mobjinfo_t *info; // &mobjinfo[mobj->type]
-
 	// Info for drawing: position.
 	fixed_t x, y, z;
+	// --- Please make sure you keep the fields up to this
+	// --- point in sync with degenmobj_t.
+
 	fixed_t old_x, old_y, old_z; // position interpolation
 	fixed_t old_x2, old_y2, old_z2;
 
+	mobjtype_t type;
+	const mobjinfo_t *info; // &mobjinfo[mobj->type]
+
 	// More list: links in sector (if needed)
 	mobj_t *snext;
 	mobj_t **sprev; // killough 8/11/98: change to ptr-to-ptr
@@ -428,14 +431,14 @@ struct precipmobj_t
 	// List: thinker links.
 	thinker_t thinker;
 
-	mobjtype_t type;
-	const mobjinfo_t *info; // &mobjinfo[mobj->type]
-
 	// Info for drawing: position.
 	fixed_t x, y, z;
 	fixed_t old_x, old_y, old_z; // position interpolation
 	fixed_t old_x2, old_y2, old_z2;
 
+	mobjtype_t type;
+	const mobjinfo_t *info; // &mobjinfo[mobj->type]
+
 	// More list: links in sector (if needed)
 	precipmobj_t *snext;
 	precipmobj_t **sprev; // killough 8/11/98: change to ptr-to-ptr