diff --git a/code/__DEFINES/traits.dm b/code/__DEFINES/traits.dm
index 4cb885db..01ab0933 100644
--- a/code/__DEFINES/traits.dm
+++ b/code/__DEFINES/traits.dm
@@ -160,6 +160,7 @@
 // common trait sources
 #define TRAIT_GENERIC "generic"
 #define EYE_DAMAGE "eye_damage"
+#define DISEASE_TRAIT "disease"
 #define GENETIC_MUTATION "genetic"
 #define OBESITY "obesity"
 #define MAGIC_TRAIT "magic"
@@ -205,4 +206,4 @@
 #define FLIGHTSUIT_TRAIT "flightsuit"
 #define LOCKED_HELMET_TRAIT "locked-helmet"
 #define NINJA_SUIT_TRAIT "ninja-suit"
-#define ANTI_DROP_IMPLANT_TRAIT "anti-drop-implant"
\ No newline at end of file
+#define ANTI_DROP_IMPLANT_TRAIT "anti-drop-implant"