diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9f70680..d233b352 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@
 ### Fixed
 ### Security
 -->
+## [v0.20.1] — 2018-09-13
+This release resolves nightly rustc error E0659 the base.rs example caused by
+[rust-lang/rust](https://github.com/rust-lang/rust) pull request
+[#52841](https://github.com/rust-lang/rust/pull/52841) "resolve: Implement prelude search for macro
+paths, implement tool attributes."
+
 ## [v0.20.0] — 2018-09-06
 This release resolves long-standing issue [#3](https://github.com/iliekturtles/uom/issues/3) to
 implement thermodynamic temperature conversions (e.g. Celsius to Fahrenheit). Support is also added
@@ -277,7 +283,8 @@ for the creation of custom systems or the use of the pre-built SI. Basic mathema
 are implemented and a minimal set of quantities (length, mass, time...) and units (meter, kilometer,
 foot, mile, ...) are included.
 
-[Unreleased]: https://github.com/iliekturtles/uom/compare/v0.20.0...master
+[Unreleased]: https://github.com/iliekturtles/uom/compare/v0.20.1...master
+[v0.20.1]: https://github.com/iliekturtles/uom/compare/v0.20.0...v0.20.1
 [v0.20.0]: https://github.com/iliekturtles/uom/compare/v0.19.0...v0.20.0
 [v0.19.0]: https://github.com/iliekturtles/uom/compare/v0.18.0...v0.19.0
 [v0.18.0]: https://github.com/iliekturtles/uom/compare/v0.17.0...v0.18.0
diff --git a/Cargo.toml b/Cargo.toml
index 1d51d5d4..5b6468a1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "uom"
-version = "0.20.0"
+version = "0.20.1"
 authors = ["Mike Boutin <mike.boutin@gmail.com>"]
 description = "Units of measurement"
 documentation = "https://docs.rs/uom"
diff --git a/README.md b/README.md
index 78506296..56731783 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Units of measurement is a crate that does automatic type-safe zero-cost
 
 ```toml
 [dependencies]
-uom = "0.20.0"
+uom = "0.20.1"
 ```
 
 and this to your crate root:
@@ -73,7 +73,7 @@ enabled by default. Features can be cherry-picked by using the `--no-default-fea
 ```toml
 [dependencies]
 uom = {
-    version = "0.20.0",
+    version = "0.20.1",
     default-features = false,
     features = [
         "autoconvert", # automatic base unit conversion.
diff --git a/src/lib.rs b/src/lib.rs
index fa086ab5..f7adc475 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,7 +18,7 @@
 //!
 //! ```toml
 //! [dependencies]
-//! uom = "0.20.0"
+//! uom = "0.20.1"
 //! ```
 //!
 //! and this to your crate root:
@@ -61,7 +61,7 @@
 //! ```toml
 //! [dependencies]
 //! uom = {
-//!     version = "0.20.0",
+//!     version = "0.20.1",
 //!     default-features = false,
 //!     features = [
 //!         "autoconvert", # automatic base unit conversion.
diff --git a/src/system.rs b/src/system.rs
index 47426a4e..e01827f0 100644
--- a/src/system.rs
+++ b/src/system.rs
@@ -1315,21 +1315,21 @@ macro_rules! system {
         #[macro_export]
         macro_rules! $quantities {
             ($path:path) => {
-                use $path as system;
+                use $path as __system;
 
                 $(/// [`Quantity`](struct.Quantity.html) type alias using the default base units
                 /// parameterized on the underlying storage type.
                 #[allow(dead_code)]
                 #[allow(unused_qualifications)]
-                pub type $quantity<V> = system::$module::$quantity<system::$units<V>, V>;)+
+                pub type $quantity<V> = __system::$module::$quantity<__system::$units<V>, V>;)+
             };
             ($path:path, $V:ty) => {
-                use $path as system;
+                use $path as __system;
 
                 $(/// [`Quantity`](struct.Quantity.html) type alias using the default base units.
                 #[allow(dead_code)]
                 #[allow(unused_qualifications)]
-                pub type $quantity = system::$module::$quantity<system::$units<$V>, $V>;)+
+                pub type $quantity = __system::$module::$quantity<__system::$units<$V>, $V>;)+
             };
             ($path:path, $V:ty, $U:tt) => {
                 system!(@quantities $path, $V; $($name),+; $U; $($module::$quantity),+);
@@ -1343,14 +1343,14 @@ macro_rules! system {
         ($($U:ident),+);
         $($module:ident::$quantity:ident),+
     ) => {
-        use $path as system;
+        use $path as __system;
 
-        type Units = system::Units<$V, $($name = system::$name::$U,)+>;
+        type Units = __system::Units<$V, $($name = __system::$name::$U,)+>;
 
         $(/// [`Quantity`](struct.Quantity.html) type alias using the given base units.
         #[allow(dead_code)]
         #[allow(unused_qualifications)]
-        pub type $quantity = system::$module::$quantity<Units, $V>;)+
+        pub type $quantity = __system::$module::$quantity<Units, $V>;)+
     };
     (@replace $_t:tt $sub:ty) => { $sub };
 }