diff --git a/code/modules/modular_computers/computers/item/pda.dm b/code/modules/modular_computers/computers/item/pda.dm
index 2fb7863445d..f1fced454e4 100644
--- a/code/modules/modular_computers/computers/item/pda.dm
+++ b/code/modules/modular_computers/computers/item/pda.dm
@@ -149,14 +149,14 @@
 	if(tool.w_class >= WEIGHT_CLASS_SMALL) // Anything equal to or larger than small won't work
 		user.balloon_alert(user, "too big!")
 		return ITEM_INTERACT_BLOCKING
-	if(inserted_item)
-		balloon_alert(user, "no room!")
-		return ITEM_INTERACT_BLOCKING
 	if(!user.transferItemToLoc(tool, src))
 		return ITEM_INTERACT_BLOCKING
-	balloon_alert(user, "inserted [tool]")
-	inserted_item = tool
-	playsound(src, 'sound/machines/pda_button1.ogg', 50, TRUE)
+	if(inserted_item)
+		swap_pen(user, tool)
+	else
+		balloon_alert(user, "inserted [tool]")
+		inserted_item = tool
+		playsound(src, 'sound/machines/pda_button1.ogg', 50, TRUE)
 	return ITEM_INTERACT_SUCCESS
 
 
@@ -185,6 +185,14 @@
 		update_appearance()
 		playsound(src, 'sound/machines/pda_button2.ogg', 50, TRUE)
 
+/obj/item/modular_computer/pda/proc/swap_pen(mob/user, obj/item/tool)
+	if(inserted_item)
+		balloon_alert(user, "swapped pens")
+		user.put_in_hands(inserted_item)
+		inserted_item = tool
+		update_appearance()
+		playsound(src, 'sound/machines/pda_button1.ogg', 50, TRUE)
+
 /obj/item/modular_computer/pda/proc/explode(mob/target, mob/bomber, from_message_menu = FALSE)
 	var/turf/current_turf = get_turf(src)