diff --git a/code/modules/mob/living/simple_animal/borer/borer_powers.dm b/code/modules/mob/living/simple_animal/borer/borer_powers.dm
index 938ac67432b..ebb3e3cbaad 100644
--- a/code/modules/mob/living/simple_animal/borer/borer_powers.dm
+++ b/code/modules/mob/living/simple_animal/borer/borer_powers.dm
@@ -73,8 +73,12 @@
 		if(!E || E.is_stump())
 			to_chat(src, SPAN_WARNING("\The [H] does not have a head!"))
 			return
-		if(!H.species.has_organ[BP_BRAIN])
-			to_chat(src, SPAN_WARNING("\The [H] does not seem to have an ear canal to breach."))
+		var/obj/item/organ/internal/I = H.species.has_organ[BP_BRAIN]
+		if(!I)
+			to_chat(src, SPAN_WARNING("\The [H] doesn't have a brain!"))
+			return
+		if(istype(I, /obj/item/organ/internal/borer))
+			to_chat(src, SPAN_WARNING("You cannot infest someone who is already infested!"))
 			return
 		if(H.isSynthetic())
 			to_chat(src, SPAN_NOTICE("You can't affect synthetics."))
diff --git a/html/changelogs/geeves-me_brain_wurm.yml b/html/changelogs/geeves-me_brain_wurm.yml
new file mode 100644
index 00000000000..004da299dbe
--- /dev/null
+++ b/html/changelogs/geeves-me_brain_wurm.yml
@@ -0,0 +1,6 @@
+author: Geeves
+
+delete-after: True
+
+changes:
+  - bugfix: "Multiple borers can no longer infect the same host."
\ No newline at end of file