diff --git a/code/modules/surgery/surgery.dm b/code/modules/surgery/surgery.dm
index c5e883e79a4..339f1a6070f 100644
--- a/code/modules/surgery/surgery.dm
+++ b/code/modules/surgery/surgery.dm
@@ -98,7 +98,7 @@ proc/do_surgery(mob/living/carbon/M, mob/living/user, obj/item/tool)
 				//We had proper tools! (or RNG smiled.) and user did not move or change hands.
 				if(prob(S.tool_quality(tool)) &&  do_mob(user, M, rand(S.min_duration, S.max_duration)))
 					S.end_step(user, M, user.zone_sel.selecting, tool)		//finish successfully
-				else if (tool in user.contents && user.Adjacent(M))			//or
+				else if ((tool in user.contents) && user.Adjacent(M))			//or
 					S.fail_step(user, M, user.zone_sel.selecting, tool)		//malpractice~
 				else // This failing silently was a pain.
 					user << "\red You must remain close to your patient to conduct surgery."