diff --git a/portal_api.lua b/portal_api.lua
index e9e63e2..bec8e0f 100644
--- a/portal_api.lua
+++ b/portal_api.lua
@@ -2007,7 +2007,8 @@ local wormhole_nodedef_default = {
 		a = 160, r = 128, g = 0, b = 80
 	},
 	sunlight_propagates = true,
-	use_texture_alpha = "blend",
+	use_texture_alpha = minetest.features.use_texture_alpha_string_modes
+		and "blend" or true,
 	walkable = false,
 	diggable = false,
 	pointable = false,