diff --git a/mods/stairs/init.lua b/mods/stairs/init.lua
index b2925ef3..230b22c8 100644
--- a/mods/stairs/init.lua
+++ b/mods/stairs/init.lua
@@ -165,7 +165,7 @@ function stairs.register_stair(
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
-		use_texture_alpha = alpha,
+		use_texture_alpha = clip,
 		light_source = light,
 		sunlight_propagates = propa,
 		groups = new_groups,
@@ -240,7 +240,7 @@ function stairs.register_slab(
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
-		use_texture_alpha = alpha,
+		use_texture_alpha = clip,
 		light_source = light,
 		sunlight_propagates = propa,
 		groups = new_groups,
@@ -301,7 +301,7 @@ function stairs.register_stair_outer(
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
-		use_texture_alpha = alpha,
+		use_texture_alpha = clip,
 		light_source = light,
 		sunlight_propagates = propa,
 		groups = new_groups,
@@ -373,7 +373,7 @@ function stairs.register_stair_inner(
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
-		use_texture_alpha = alpha,
+		use_texture_alpha = clip,
 		light_source = light,
 		sunlight_propagates = propa,
 		groups = new_groups,
@@ -447,7 +447,7 @@ function stairs.register_slope(
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
-		use_texture_alpha = alpha,
+		use_texture_alpha = clip,
 		light_source = light,
 		sunlight_propagates = propa,
 		groups = new_groups,