diff --git a/derive_builder/Cargo.toml b/derive_builder/Cargo.toml
index 858b6a4..f822126 100644
--- a/derive_builder/Cargo.toml
+++ b/derive_builder/Cargo.toml
@@ -28,7 +28,6 @@ alloc = ["derive_builder_macro/alloc"]
 derive_builder_macro = { version = "=0.20.1", path = "../derive_builder_macro" }
 
 [dev-dependencies]
-pretty_assertions = "0.6.1"
 rustversion = "1.0.4"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
diff --git a/derive_builder/tests/builder_field_custom.rs b/derive_builder/tests/builder_field_custom.rs
index 5cd4f42..3195e82 100644
--- a/derive_builder/tests/builder_field_custom.rs
+++ b/derive_builder/tests/builder_field_custom.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 use std::num::ParseIntError;
diff --git a/derive_builder/tests/builder_name.rs b/derive_builder/tests/builder_name.rs
index 3b2cd57..d3e2a24 100644
--- a/derive_builder/tests/builder_name.rs
+++ b/derive_builder/tests/builder_name.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/compile-fail/rename_setter_struct_level.rs b/derive_builder/tests/compile-fail/rename_setter_struct_level.rs
index 7565efe..dec2137 100644
--- a/derive_builder/tests/compile-fail/rename_setter_struct_level.rs
+++ b/derive_builder/tests/compile-fail/rename_setter_struct_level.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
@@ -17,9 +15,11 @@ fn main() {
         .build()
         .unwrap();
 
-    assert_eq!(x,
-               Lorem {
-                   ipsum: "ipsum",
-                   dolor: "dolor",
-               });
+    assert_eq!(
+        x,
+        Lorem {
+            ipsum: "ipsum",
+            dolor: "dolor",
+        }
+    );
 }
diff --git a/derive_builder/tests/custom_constructor.rs b/derive_builder/tests/custom_constructor.rs
index b4daabb..f55b86b 100644
--- a/derive_builder/tests/custom_constructor.rs
+++ b/derive_builder/tests/custom_constructor.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Eq, Builder)]
diff --git a/derive_builder/tests/custom_default.rs b/derive_builder/tests/custom_default.rs
index 8fd6d21..1494392 100644
--- a/derive_builder/tests/custom_default.rs
+++ b/derive_builder/tests/custom_default.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 mod field_level {
diff --git a/derive_builder/tests/generic_structs.rs b/derive_builder/tests/generic_structs.rs
index f5119f5..8887694 100644
--- a/derive_builder/tests/generic_structs.rs
+++ b/derive_builder/tests/generic_structs.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 use std::clone::Clone;
diff --git a/derive_builder/tests/generic_with_default.rs b/derive_builder/tests/generic_with_default.rs
index 81a5eaa..3894686 100644
--- a/derive_builder/tests/generic_with_default.rs
+++ b/derive_builder/tests/generic_with_default.rs
@@ -1,7 +1,5 @@
 #[macro_use]
 extern crate derive_builder;
-#[macro_use]
-extern crate pretty_assertions;
 
 /// Struct taken from `@shockham/caper` to make sure we emit the correct
 /// code for struct-level defaults in tandem with generics.
diff --git a/derive_builder/tests/lifetime.rs b/derive_builder/tests/lifetime.rs
index 13f2a08..c61d636 100644
--- a/derive_builder/tests/lifetime.rs
+++ b/derive_builder/tests/lifetime.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_custom.rs b/derive_builder/tests/setter_custom.rs
index af7df5e..fa936ca 100644
--- a/derive_builder/tests/setter_custom.rs
+++ b/derive_builder/tests/setter_custom.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_extend.rs b/derive_builder/tests/setter_extend.rs
index 496c656..1ce1d8d 100644
--- a/derive_builder/tests/setter_extend.rs
+++ b/derive_builder/tests/setter_extend.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 use std::collections::HashMap;
diff --git a/derive_builder/tests/setter_into.rs b/derive_builder/tests/setter_into.rs
index b73852d..e8db1c0 100644
--- a/derive_builder/tests/setter_into.rs
+++ b/derive_builder/tests/setter_into.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_name.rs b/derive_builder/tests/setter_name.rs
index e1ddade..8c3d740 100644
--- a/derive_builder/tests/setter_name.rs
+++ b/derive_builder/tests/setter_name.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_pattern.rs b/derive_builder/tests/setter_pattern.rs
index b445489..f6a82f0 100644
--- a/derive_builder/tests/setter_pattern.rs
+++ b/derive_builder/tests/setter_pattern.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_prefix.rs b/derive_builder/tests/setter_prefix.rs
index 2b423c7..6fdf59b 100644
--- a/derive_builder/tests/setter_prefix.rs
+++ b/derive_builder/tests/setter_prefix.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_strip_option.rs b/derive_builder/tests/setter_strip_option.rs
index d502340..71de621 100644
--- a/derive_builder/tests/setter_strip_option.rs
+++ b/derive_builder/tests/setter_strip_option.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, PartialEq, Default, Builder, Clone)]
diff --git a/derive_builder/tests/setter_visibility.rs b/derive_builder/tests/setter_visibility.rs
index 9995093..438273b 100644
--- a/derive_builder/tests/setter_visibility.rs
+++ b/derive_builder/tests/setter_visibility.rs
@@ -1,6 +1,4 @@
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 pub mod foo {
diff --git a/derive_builder/tests/skip-setter.rs b/derive_builder/tests/skip-setter.rs
index 3b4e75c..9c1fb53 100644
--- a/derive_builder/tests/skip-setter.rs
+++ b/derive_builder/tests/skip-setter.rs
@@ -1,7 +1,5 @@
 // https://github.com/colin-kiegel/rust-derive-builder/issues/15
 #[macro_use]
-extern crate pretty_assertions;
-#[macro_use]
 extern crate derive_builder;
 
 #[derive(Debug, Clone, PartialEq)]
diff --git a/derive_builder_core/src/lib.rs b/derive_builder_core/src/lib.rs
index da5737d..57e5989 100644
--- a/derive_builder_core/src/lib.rs
+++ b/derive_builder_core/src/lib.rs
@@ -27,10 +27,6 @@ extern crate proc_macro2;
 extern crate syn;
 #[macro_use]
 extern crate quote;
-#[cfg(test)]
-#[macro_use]
-extern crate pretty_assertions;
-
 mod block;
 mod build_method;
 mod builder;