diff --git a/code/modules/reagents/reagent_containers/syringes.dm b/code/modules/reagents/reagent_containers/syringes.dm
index c44da6e511d..dc041188a9c 100644
--- a/code/modules/reagents/reagent_containers/syringes.dm
+++ b/code/modules/reagents/reagent_containers/syringes.dm
@@ -125,7 +125,7 @@
 							B = T.take_blood(src,amount)
 
 						if (B)
-							src.reagents.reagent_list += B
+							src.reagents.reagent_list |= B
 							src.reagents.update_total()
 							src.on_reagent_change()
 							src.reagents.handle_reactions()