diff --git a/mods/nc_terrain/node.lua b/mods/nc_terrain/node.lua
index bf79316..38af504 100644
--- a/mods/nc_terrain/node.lua
+++ b/mods/nc_terrain/node.lua
@@ -286,6 +286,7 @@ nodecore.register_limited_abm({
 		interval = 1,
 		chance = 2,
 		nodenames = {src},
+    neighbours = {flow},
 		action = function(pos, node)
 			local miny = pos.y
 			local found = {}
@@ -332,6 +333,7 @@ nodecore.register_limited_abm({
 		interval = 2,
 		chance = 2,
 		nodenames = {src2},
+    neighbours = {flow2},
 		action = function(pos, node)
 			local miny = pos.y
 			local found = {}