diff --git a/code/__DEFINES/traits.dm b/code/__DEFINES/traits.dm
index 2776b2b0..c47c6052 100644
--- a/code/__DEFINES/traits.dm
+++ b/code/__DEFINES/traits.dm
@@ -161,6 +161,7 @@
 // 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"