diff --git a/code/game/turfs/simulated/floor/plating/asteroid.dm b/code/game/turfs/simulated/floor/plating/asteroid.dm
index 2649a3a14d..848a7e8219 100644
--- a/code/game/turfs/simulated/floor/plating/asteroid.dm
+++ b/code/game/turfs/simulated/floor/plating/asteroid.dm
@@ -193,7 +193,7 @@
 
 		var/list/L = list(45)
 		if(IsOdd(dir2angle(dir))) // We're going at an angle and we want thick angled tunnels.
-			L += -45
+			L -= 45
 
 		// Expand the edges of our tunnel
 		for(var/edge_angle in L)
diff --git a/code/modules/mob/living/simple_animal/friendly/drone/visuals_icons.dm b/code/modules/mob/living/simple_animal/friendly/drone/visuals_icons.dm
index 259ca4327d..325b971171 100644
--- a/code/modules/mob/living/simple_animal/friendly/drone/visuals_icons.dm
+++ b/code/modules/mob/living/simple_animal/friendly/drone/visuals_icons.dm
@@ -86,7 +86,7 @@
 		if(istype(head, /obj/item/clothing/mask))
 			used_head_icon = 'icons/mob/mask.dmi'
 		var/mutable_appearance/head_overlay = head.build_worn_icon(state = head.icon_state, default_layer = DRONE_HEAD_LAYER, default_icon_file = used_head_icon)
-		head_overlay.pixel_y += -15
+		head_overlay.pixel_y -= 15
 
 		drone_overlays[DRONE_HEAD_LAYER] = head_overlay
 
diff --git a/code/modules/projectiles/projectile/bullets.dm b/code/modules/projectiles/projectile/bullets.dm
index dda3023853..8395ef4d83 100644
--- a/code/modules/projectiles/projectile/bullets.dm
+++ b/code/modules/projectiles/projectile/bullets.dm
@@ -10,7 +10,7 @@
 
 /obj/item/projectile/bullet/pellet/Range()
 	..()
-	damage += -0.75
+	damage -= 0.75
 	if(damage < 0)
 		qdel(src)