diff --git a/change.log b/change.log
index 8d81423..67918d9 100644
--- a/change.log
+++ b/change.log
@@ -91,3 +91,7 @@ v0.1.15
 
 v0.1.16
 *	Fixed piston interaction with non-walkable nodes.
+
+
+v0.1.17
+*	Fixed unintended global variable in pistons.lua.
diff --git a/init.lua b/init.lua
index 0981bfd..797fd39 100644
--- a/init.lua
+++ b/init.lua
@@ -1,4 +1,4 @@
-local version = "0.1.16"
+local version = "0.1.17"
 local mod_storage = minetest.get_mod_storage ()
 
 
diff --git a/pistons.lua b/pistons.lua
index 9b99a76..4e5fa9c 100644
--- a/pistons.lua
+++ b/pistons.lua
@@ -52,7 +52,7 @@ local function push_entities (pos, vec)
 		if tnode.name == "air" then
 			can_move = true
 		else
-			tdef = utils.find_item_def (tnode.name)
+			local tdef = utils.find_item_def (tnode.name)
 
 			can_move = tdef and not tdef.walkable
 		end
diff --git a/readme.txt b/readme.txt
index e4d8663..4ee195a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -13,7 +13,7 @@ CC BY-SA 3.0
 
 Version
 =======
-0.1.16
+0.1.17
 
 
 Minetest Version