diff --git a/src/tools/Cargo.toml b/src/tools/Cargo.toml
index 6417c5aa..7d477f30 100644
--- a/src/tools/Cargo.toml
+++ b/src/tools/Cargo.toml
@@ -2,6 +2,7 @@
 name = "dmm-tools"
 version = "0.1.0"
 authors = ["Tad Hardesty <tad@platymuus.com>"]
+edition = "2018"
 
 [lib]
 path = "lib.rs"
diff --git a/src/tools/dmm.rs b/src/tools/dmm.rs
index f932f8e7..508afcd7 100644
--- a/src/tools/dmm.rs
+++ b/src/tools/dmm.rs
@@ -9,7 +9,7 @@ use linked_hash_map::LinkedHashMap;
 
 use dm::{DMError, Location};
 use dm::constants::Constant;
-use dmi::Dir;
+use crate::dmi::Dir;
 
 mod read;
 mod save_tgm;
diff --git a/src/tools/lint.rs b/src/tools/lint.rs
index 45bd0fcd..7fe3b11d 100644
--- a/src/tools/lint.rs
+++ b/src/tools/lint.rs
@@ -3,7 +3,7 @@ use std::fmt;
 
 use dm::objtree::*;
 use dm::constants::Constant;
-use dmm::Map;
+use crate::dmm::Map;
 
 macro_rules! lints {
     ($($ident:ident = $desc:expr;)*) => {
diff --git a/src/tools/minimap.rs b/src/tools/minimap.rs
index d15cd214..709773cb 100644
--- a/src/tools/minimap.rs
+++ b/src/tools/minimap.rs
@@ -5,10 +5,10 @@ use ndarray::Axis;
 
 use dm::objtree::*;
 use dm::constants::Constant;
-use dmm::{Map, ZLevel, Prefab};
-use dmi::{Dir, Image};
-use render_passes::RenderPass;
-use icon_cache::IconCache;
+use crate::dmm::{Map, ZLevel, Prefab};
+use crate::dmi::{Dir, Image};
+use crate::render_passes::RenderPass;
+use crate::icon_cache::IconCache;
 
 const TILE_SIZE: u32 = 32;
 
diff --git a/src/tools/render_passes/icon_smoothing.rs b/src/tools/render_passes/icon_smoothing.rs
index 26e343b9..c0d2b51a 100644
--- a/src/tools/render_passes/icon_smoothing.rs
+++ b/src/tools/render_passes/icon_smoothing.rs
@@ -2,8 +2,8 @@
 
 use dm::objtree::ObjectTree;
 use dm::constants::Constant;
-use dmi::Dir;
-use minimap::{Sprite, Atom, GetVar, Neighborhood};
+use crate::dmi::Dir;
+use crate::minimap::{Sprite, Atom, GetVar, Neighborhood};
 
 use super::RenderPass;
 
diff --git a/src/tools/render_passes/mod.rs b/src/tools/render_passes/mod.rs
index 19fdef58..705ea40a 100644
--- a/src/tools/render_passes/mod.rs
+++ b/src/tools/render_passes/mod.rs
@@ -1,6 +1,6 @@
 use dm::objtree::*;
 use dm::constants::Constant;
-use minimap::{Atom, GetVar, Sprite, Layer, Neighborhood};
+use crate::minimap::{Atom, GetVar, Sprite, Layer, Neighborhood};
 
 mod transit_tube;
 mod random;
@@ -210,7 +210,7 @@ impl RenderPass for Overlays {
         objtree: &'a ObjectTree,
         _: &'a bumpalo::Bump,
     ) {
-        use dmi::Dir;
+        use crate::dmi::Dir;
 
         if atom.istype("/obj/machinery/power/apc/") {
             // auto-set pixel location
diff --git a/src/tools/render_passes/smart_cables.rs b/src/tools/render_passes/smart_cables.rs
index 8f30110b..b1ee0e9e 100644
--- a/src/tools/render_passes/smart_cables.rs
+++ b/src/tools/render_passes/smart_cables.rs
@@ -1,5 +1,5 @@
 use std::fmt::Write;
-use dmi::Dir;
+use crate::dmi::Dir;
 use super::*;
 
 #[derive(Default)]
diff --git a/src/tools/render_passes/transit_tube.rs b/src/tools/render_passes/transit_tube.rs
index b32ecd28..b52a1950 100644
--- a/src/tools/render_passes/transit_tube.rs
+++ b/src/tools/render_passes/transit_tube.rs
@@ -1,5 +1,5 @@
 use super::*;
-use dmi::Dir;
+use crate::dmi::Dir;
 
 #[derive(Default)]
 pub struct TransitTube;
@@ -11,7 +11,7 @@ impl RenderPass for TransitTube {
         overlays: &mut Vec<Sprite<'a>>,
         _: &bumpalo::Bump,
     ) {
-        use dmi::Dir::*;
+        use crate::dmi::Dir::*;
 
         if !atom.istype("/obj/structure/transit_tube/") {
             return;