diff --git a/nssm_api.lua b/nssm_api.lua
index cc8e7fb..ad941d8 100644
--- a/nssm_api.lua
+++ b/nssm_api.lua
@@ -723,7 +723,7 @@ local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 	if minetest.registered_nodes["tnt:tnt"] then
 		c_tnt = minetest.get_content_id("tnt:tnt")
 	else
-		c_tnt = tnt_burning
+		c_tnt = c_tnt_burning
 	end
 
 	for z = pos.z - 2, pos.z + 2 do