diff --git a/code/modules/lighting/lighting_source.dm b/code/modules/lighting/lighting_source.dm
index de9e8a90ca..fd5ea917a1 100644
--- a/code/modules/lighting/lighting_source.dm
+++ b/code/modules/lighting/lighting_source.dm
@@ -122,7 +122,7 @@
 
 //Linear lighting falloff but with an octagonal shape in place of a diamond shape. Lummox JR please add pointer support.
 #define GET_LUM_DIST(DISTX, DISTY) (DISTX + DISTY + abs(DISTX - DISTY)*0.4)
-#define LUM_FALLOFF(C, T) (1 - CLAMP01(GET_LUM_DIST(abs(C.x - T.x), abs(C.y - T.y)) / max(1, light_range+1)))
+#define LUM_FALLOFF(C, T) (1 - CLAMP01(max(GET_LUM_DIST(abs(C.x - T.x), abs(C.y - T.y)),LIGHTING_HEIGHT) / max(1, light_range+1)))
 
 #define APPLY_CORNER(C)                      \
 	. = LUM_FALLOFF(C, pixel_turf);          \