diff --git a/code/modules/power/gravitygenerator.dm b/code/modules/power/gravitygenerator.dm
index c720875aeb9..721058952b9 100644
--- a/code/modules/power/gravitygenerator.dm
+++ b/code/modules/power/gravitygenerator.dm
@@ -354,14 +354,14 @@ var/const/GRAV_NEEDS_WRENCH = 3
 
 // Shake everyone on the z level to let them know that gravity was enagaged/disenagaged.
 /obj/machinery/gravity_generator/main/proc/shake_everyone()
-	var/turf/our_turf = get_turf(src)
+	var/turf/T = get_turf(src)
 	for(var/mob/M in mob_list)
-		var/turf/their_turf = get_turf(M)
-		if(their_turf.z == our_turf.z)
-			M.update_gravity(M.mob_has_gravity())
-			if(M.client)
-				shake_camera(M, 15, 1)
-				M.playsound_local(our_turf, 'sound/effects/alert.ogg', 100, 1, 0.5)
+		if(M.z != z)
+			continue
+		M.update_gravity(M.mob_has_gravity())
+		if(M.client)
+			shake_camera(M, 15, 1)
+			M.playsound_local(T, 'sound/effects/alert.ogg', 100, 1, 0.5)
 
 /obj/machinery/gravity_generator/main/proc/gravity_in_level()
 	var/turf/T = get_turf(src)