diff --git a/code/__DEFINES/DNA.dm b/code/__DEFINES/DNA.dm
index 6913473e88..9ebe6bb552 100644
--- a/code/__DEFINES/DNA.dm
+++ b/code/__DEFINES/DNA.dm
@@ -138,8 +138,8 @@
 
 ////organ defines
 #define STANDARD_ORGAN_THRESHOLD 	100
-#define STANDARD_ORGAN_HEALING 		0.001
-#define STANDARD_ORGAN_DECAY		0.00222		//designed to fail organs when left to decay for ~15 minutes
+#define STANDARD_ORGAN_HEALING 		(1/(15 MINUTES / 1 SECOND))
+#define STANDARD_ORGAN_DECAY		(1/(15 MINUTES / 1 SECOND))		//designed to fail organs when left to decay for ~15 minutes. 1 SECOND is SSmobs tickrate.
 
 #define G_MALE 1
 #define G_FEMALE 2