diff --git a/code/modules/mob/mob_defines.dm b/code/modules/mob/mob_defines.dm
index a9f2c09998..f47acbe3c4 100644
--- a/code/modules/mob/mob_defines.dm
+++ b/code/modules/mob/mob_defines.dm
@@ -38,7 +38,7 @@
 	var/resting = 0			//Carbon
 	var/lying = 0
 	var/lying_prev = 0
-	var/is_shifted = 0
+	var/is_shifted = FALSE
 
 	//MOVEMENT SPEED
 	var/list/movespeed_modification				//Lazy list, see mob_movespeed.dm