diff --git a/Cargo.toml b/Cargo.toml
index fe655ddb..a9f305c1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ name = "mooneye-gb"
 version = "0.2.0-pre"
 authors = ["Joonas Javanainen <joonas.javanainen@gmail.com>"]
 license = "GPL-3.0+"
+edition = "2018"
 
 [dependencies]
 arraydeque = "0.4"
diff --git a/core/src/config/bootrom.rs b/core/src/config/bootrom.rs
index d16a7dbe..e493ce26 100644
--- a/core/src/config/bootrom.rs
+++ b/core/src/config/bootrom.rs
@@ -124,7 +124,8 @@ impl Bootrom {
             Model::Mgb => include_bytes!("../../bootroms/mgb_boot.bin"),
             Model::Sgb => include_bytes!("../../bootroms/sgb_boot.bin"),
             Model::Sgb2 => include_bytes!("../../bootroms/sgb2_boot.bin"),
-          }.clone(),
+          }
+          .clone(),
         )),
       }
     })
diff --git a/core/src/hardware/mod.rs b/core/src/hardware/mod.rs
index 6138307d..be096fe6 100644
--- a/core/src/hardware/mod.rs
+++ b/core/src/hardware/mod.rs
@@ -26,7 +26,7 @@ use hardware::gpu::Gpu;
 use hardware::irq::{Interrupt, InterruptRequest, Irq};
 use hardware::joypad::Joypad;
 use hardware::serial::Serial;
-use hardware::timer::{Timer, Div, Tima, Tma, Tac};
+use hardware::timer::{Div, Tac, Tima, Timer, Tma};
 use hardware::work_ram::WorkRam;
 use GbKey;
 
@@ -328,7 +328,10 @@ impl Hardware {
     self.timer.tick_cycle(&mut self.irq);
     f(self)
   }
-  fn read_cycle_timer<T>(&mut self, addr: T) -> u8 where Timer: MappedHardware<T> {
+  fn read_cycle_timer<T>(&mut self, addr: T) -> u8
+  where
+    Timer: MappedHardware<T>,
+  {
     self.emulate_internal();
     self.timer.read_cycle(addr, &mut self.irq)
   }
@@ -337,7 +340,10 @@ impl Hardware {
     self.timer.tick_cycle(&mut self.irq);
     f(self)
   }
-  fn write_cycle_timer<T>(&mut self, addr: T, value: u8) where Timer: MappedHardware<T> {
+  fn write_cycle_timer<T>(&mut self, addr: T, value: u8)
+  where
+    Timer: MappedHardware<T>,
+  {
     self.emulate_internal();
     self.timer.write_cycle(addr, value, &mut self.irq)
   }
diff --git a/src/frontend/emu_thread.rs b/src/frontend/emu_thread.rs
index a14bd5f0..d6eb6eba 100644
--- a/src/frontend/emu_thread.rs
+++ b/src/frontend/emu_thread.rs
@@ -7,8 +7,8 @@ use std::sync::mpsc;
 use std::thread;
 use std::time::Duration;
 
-use frame_times::FrameTimes;
-use perf_counter::PerfCounter;
+use crate::frame_times::FrameTimes;
+use crate::perf_counter::PerfCounter;
 
 #[derive(Debug)]
 pub struct EmuThreadHandle {
diff --git a/src/frontend/mod.rs b/src/frontend/mod.rs
index d875259d..81ec5171 100644
--- a/src/frontend/mod.rs
+++ b/src/frontend/mod.rs
@@ -25,13 +25,13 @@ use std::time::Duration;
 
 use self::gui::Screen;
 use self::renderer::Renderer;
-use fps_counter::FpsCounter;
-use frame_times::FrameTimes;
+use crate::fps_counter::FpsCounter;
+use crate::frame_times::FrameTimes;
+use crate::perf_counter::PerfCounter;
 use mooneye_gb::config::{Bootrom, Cartridge, HardwareConfig};
 use mooneye_gb::emulation::{EmuEvents, EmuTime};
 use mooneye_gb::machine::Machine;
 use mooneye_gb::*;
-use perf_counter::PerfCounter;
 
 mod emu_thread;
 mod gui;
diff --git a/src/main.rs b/src/main.rs
index b9d30bf7..19904659 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -41,7 +41,7 @@ use simplelog::{LevelFilter, TermLogger};
 use std::path::Path;
 use std::process;
 
-use frontend::SdlFrontend;
+use crate::frontend::SdlFrontend;
 
 mod fps_counter;
 mod frame_times;