diff --git a/.travis.yml b/.travis.yml
index 78123dc8..40ad6ad1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,7 +31,8 @@ matrix:
     script: |
       set -e
       cargo test --verbose --features "use_serde"
-      cargo test --manifest-path tests/feature_check/Cargo.toml --verbose
+      cargo test -p feature_check --verbose
+      cargo test -p edition_check --verbose
       cargo test --verbose --no-default-features --features "autoconvert f32 f64 si use_serde"
       cargo test --verbose --no-run --no-default-features --features "autoconvert usize u8 u16 u32 u64 isize i8 i16 i32 i64 bigint biguint rational rational32 rational64 bigrational f32 f64 std use_serde"
   - name: Rustfmt
diff --git a/Cargo.toml b/Cargo.toml
index 3d4c0a14..ef801304 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,7 @@ maintenance = { status = "actively-developed" }
 [workspace]
 members = [
     "uom-macros",
+    "tests/edition_check",
     "tests/feature_check",
 ]
 
diff --git a/examples/mks.rs b/examples/mks.rs
index 2f7fa907..b1621c00 100644
--- a/examples/mks.rs
+++ b/examples/mks.rs
@@ -85,5 +85,5 @@ mod f32 {
         pub use *;
     }
 
-    Q!(f32::s, f32);
+    Q!(crate::f32::s, f32);
 }
diff --git a/src/quantity.rs b/src/quantity.rs
index b0ca6b27..f664ff62 100644
--- a/src/quantity.rs
+++ b/src/quantity.rs
@@ -86,7 +86,7 @@
 /// #         }
 /// #     }
 /// #     mod f32 {
-/// #         Q!(mks, f32/*, (centimeter, gram, second)*/);
+/// #         Q!(crate::mks, f32/*, (centimeter, gram, second)*/);
 /// #     }
 /// # }
 /// ```
diff --git a/src/si/mod.rs b/src/si/mod.rs
index 52892ce5..ac4486b3 100644
--- a/src/si/mod.rs
+++ b/src/si/mod.rs
@@ -59,12 +59,12 @@ system! {
 /// [`Quantity`](struct.Quantity.html) type aliases using the default base units and parameterized
 /// on the underlying storage type.
 pub mod quantities {
-    ISQ!(si);
+    ISQ!(::si);
 }
 
 storage_types! {
     /// [`Quantity`](struct.Quantity.html) type aliases using the default base units.
     pub types: All;
 
-    ISQ!(si, V);
+    ISQ!(::si, V);
 }
diff --git a/src/system.rs b/src/system.rs
index 930a4a55..b935ea5a 100644
--- a/src/system.rs
+++ b/src/system.rs
@@ -77,7 +77,7 @@
 ///     }
 /// }
 /// #     mod f32 {
-/// #         Q!(mks, f32/*, (centimeter, gram, second)*/);
+/// #         Q!(crate::mks, f32/*, (centimeter, gram, second)*/);
 /// #     }
 /// # }
 /// ```
@@ -1455,7 +1455,7 @@ macro_rules! system {
         /// #         }
         /// #     }
         /// mod f32 {
-        ///     Q!(mks, f32/*, (centimeter, gram, second)*/);
+        ///     Q!(super, f32/*, (centimeter, gram, second)*/);
         /// }
         /// # }
         /// ```
diff --git a/src/tests/quantities.rs b/src/tests/quantities.rs
index 83e324fe..e9a56a12 100644
--- a/src/tests/quantities.rs
+++ b/src/tests/quantities.rs
@@ -42,7 +42,7 @@ fn plural() {
 storage_types! {
     use tests::*;
 
-    Q!(tests, V);
+    Q!(crate::tests, V);
 
     #[test]
     fn struct_literal() {
@@ -118,7 +118,7 @@ mod float {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         #[test]
         fn floor() {
diff --git a/src/tests/quantity.rs b/src/tests/quantity.rs
index 2075dfaf..a54707ae 100644
--- a/src/tests/quantity.rs
+++ b/src/tests/quantity.rs
@@ -3,8 +3,8 @@
 storage_types! {
     use tests::*;
 
-    mod f { Q!(tests, super::V); }
-    mod k { Q!(tests, super::V, (kilometer, kilogram, kelvin)); }
+    mod f { Q!(crate::tests, super::V); }
+    mod k { Q!(crate::tests, super::V, (kilometer, kilogram, kelvin)); }
 
     #[test]
     fn new() {
@@ -207,7 +207,7 @@ mod fmt {
     storage_types! {
         use tests::*;
 
-        mod f { Q!(tests, super::V); }
+        mod f { Q!(crate::tests, super::V); }
 
         quickcheck! {
             #[allow(trivial_casts)]
@@ -238,7 +238,7 @@ mod fmt {
 
             use tests::*;
 
-            mod f { Q!(tests, super::V); }
+            mod f { Q!(crate::tests, super::V); }
 
             quickcheck! {
                 #[allow(trivial_casts)]
@@ -261,7 +261,7 @@ mod fmt {
 
             use tests::*;
 
-            mod f { Q!(tests, super::V); }
+            mod f { Q!(crate::tests, super::V); }
 
             quickcheck! {
                 #[allow(trivial_casts)]
@@ -295,8 +295,8 @@ mod non_big {
 
         use tests::*;
 
-        mod f { Q!(tests, super::V); }
-        mod k { Q!(tests, super::V, (kilometer, kilogram, kelvin)); }
+        mod f { Q!(crate::tests, super::V); }
+        mod k { Q!(crate::tests, super::V, (kilometer, kilogram, kelvin)); }
 
         quickcheck! {
             #[allow(trivial_casts)]
@@ -345,8 +345,8 @@ mod float {
 
         use tests::*;
 
-        mod f { Q!(tests, super::V); }
-        mod k { Q!(tests, super::V, (kilometer, kilogram, kelvin)); }
+        mod f { Q!(crate::tests, super::V); }
+        mod k { Q!(crate::tests, super::V, (kilometer, kilogram, kelvin)); }
 
         #[test]
         fn floor() {
diff --git a/src/tests/system.rs b/src/tests/system.rs
index 6d3d3180..6dd4da17 100644
--- a/src/tests/system.rs
+++ b/src/tests/system.rs
@@ -8,7 +8,7 @@ storage_types! {
     type KilometerFahrenheitBase = Units<V, length = kilometer, mass = kilogram,
         thermodynamic_temperature = degree_fahrenheit>;
 
-    Q!(tests, V);
+    Q!(crate::tests, V);
 
     #[test]
     fn zero() {
@@ -237,7 +237,7 @@ mod prim_int {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         quickcheck! {
             #[allow(trivial_casts)]
@@ -263,7 +263,7 @@ mod float {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         #[test]
         fn fp_categories() {
@@ -393,7 +393,7 @@ mod signed {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         quickcheck! {
             #[allow(trivial_casts)]
@@ -423,7 +423,7 @@ mod non_ratio {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         #[test]
         fn default() {
@@ -438,7 +438,7 @@ mod non_big {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         quickcheck! {
             #[allow(trivial_casts)]
@@ -513,7 +513,7 @@ mod primitive {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         #[test]
         fn sum() {
@@ -555,7 +555,7 @@ mod fixed {
 
         use tests::*;
 
-        Q!(tests, V);
+        Q!(crate::tests, V);
 
         quickcheck! {
             #[allow(trivial_casts)]
diff --git a/tests/edition_check/Cargo.toml b/tests/edition_check/Cargo.toml
new file mode 100644
index 00000000..ec0a26a3
--- /dev/null
+++ b/tests/edition_check/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "edition_check"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+# Include `use_serde` to re-use `uom` compiled by `cargo test --verbose --features "use_serde"`
+uom = { path = "../..", features = ["use_serde"] }
+
+[features]
+default = []
diff --git a/tests/edition_check/src/lib.rs b/tests/edition_check/src/lib.rs
new file mode 100644
index 00000000..546499ef
--- /dev/null
+++ b/tests/edition_check/src/lib.rs
@@ -0,0 +1,63 @@
+//! Validate that the `system!`, `quantity!`, and `$quantities!` macros generate valid code for the
+//! 2018 edition.
+
+#[macro_use]
+extern crate uom;
+
+mod mks {
+    mod length {
+        quantity! {
+            /// Length (base unit meter, m<sup>1</sup>).
+            quantity: Length; "length";
+            /// Length dimension, m<sup>1</sup>.
+            dimension: Q<P1 /*length*/, Z0 /*mass*/, Z0 /*time*/>;
+            units {
+                @meter: 1.0E0; "m", "meter", "meters";
+                @foot: 3.048E-1; "ft", "foot", "feet";
+            }
+        }
+    }
+
+    mod mass {
+        quantity! {
+            /// Mass (base unit kilogram, kg<sup>1</sup>).
+            quantity: Mass; "mass";
+            /// Mass dimension, kg<sup>1</sup>.
+            dimension: Q<Z0 /*length*/, P1 /*mass*/, Z0 /*time*/>;
+            units {
+                @kilogram: 1.0; "kg", "kilogram", "kilograms";
+            }
+        }
+    }
+
+    mod time {
+        quantity! {
+            /// Time (base unit second, s<sup>1</sup>).
+            quantity: Time; "time";
+            /// Time dimension, s<sup>1</sup>.
+            dimension: Q<Z0 /*length*/, Z0 /*mass*/, P1 /*time*/>;
+            units {
+                @second: 1.0; "s", "second", "seconds";
+            }
+        }
+    }
+
+    system! {
+        /// System of quantities, Q.
+        quantities: Q {
+            length: meter, L;
+            mass: kilogram, M;
+            time: second, T;
+        }
+        /// System of units, U.
+        units: U {
+            mod length::Length,
+            mod mass::Mass,
+            mod time::Time,
+        }
+    }
+
+    mod f32 {
+        Q!(crate::mks, f32 /*, (centimeter, gram, second)*/);
+    }
+}
diff --git a/tests/feature_check/Cargo.toml b/tests/feature_check/Cargo.toml
index 4cf062f0..f65f9720 100644
--- a/tests/feature_check/Cargo.toml
+++ b/tests/feature_check/Cargo.toml
@@ -3,7 +3,8 @@ name = "feature_check"
 version = "0.1.0"
 
 [dependencies]
-uom = { path = "../.." }
+# Include `use_serde` to re-use `uom` compiled by `cargo test --verbose --features "use_serde"`
+uom = { path = "../..", features = ["use_serde"] }
 
 [features]
 default = []
diff --git a/tests/feature_check/src/lib.rs b/tests/feature_check/src/lib.rs
index 50d17dae..e4a09023 100644
--- a/tests/feature_check/src/lib.rs
+++ b/tests/feature_check/src/lib.rs
@@ -44,7 +44,7 @@
 //! mod f32 {
 //!     mod s { pub use *; }
 //!
-//!     Q!(f32::s, f32);
+//!     Q!(crate::f32::s, f32);
 //! }
 //!
 //! fn main() {