diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs
index 1f1fd90f363a..e3941e108089 100644
--- a/clippy_lints/src/methods/mod.rs
+++ b/clippy_lints/src/methods/mod.rs
@@ -1785,7 +1785,7 @@ impl_lint_pass!(Methods => [
     INSPECT_FOR_EACH,
     IMPLICIT_CLONE,
     SUSPICIOUS_SPLITN,
-    MANUAL_STR_REPEAT
+    MANUAL_STR_REPEAT,
     APPEND_INSTEAD_OF_EXTEND
 ]);
 
diff --git a/tests/ui/append_instead_of_extend.fixed b/tests/ui/append_instead_of_extend.fixed
index a0d2e2df6440..283358333cdf 100644
--- a/tests/ui/append_instead_of_extend.fixed
+++ b/tests/ui/append_instead_of_extend.fixed
@@ -13,10 +13,9 @@ fn main() {
 
     vec4.append(&mut vec3);
 
-    let mut vec10 = return_vector();
     let mut vec11: std::vec::Vec<u8> = Vec::new();
 
-    vec11.append(&mut vec10);
+    vec11.append(&mut return_vector());
 
     //won't get linted it dosen't move the entire content of a vec into another
     let mut test1 = vec![0u8, 10];
@@ -34,10 +33,9 @@ fn main() {
 
     vec5.extend(vec6.drain(..4));
 
-    let mut vec8 = return_vector();
     let mut vec9: std::vec::Vec<u8> = Vec::new();
 
-    vec8.append(&mut vec9);
+    return_vector().append(&mut vec9);
 
     //won't get linted because it is not a vec
 
diff --git a/tests/ui/append_instead_of_extend.rs b/tests/ui/append_instead_of_extend.rs
index 3b84d934b884..abde5cdac5cf 100644
--- a/tests/ui/append_instead_of_extend.rs
+++ b/tests/ui/append_instead_of_extend.rs
@@ -13,10 +13,9 @@ fn main() {
 
     vec4.extend(vec3.drain(..));
 
-    let mut vec10 = return_vector();
     let mut vec11: std::vec::Vec<u8> = Vec::new();
 
-    vec11.extend(vec10.drain(..));
+    vec11.extend(return_vector().drain(..));
 
     //won't get linted it dosen't move the entire content of a vec into another
     let mut test1 = vec![0u8, 10];
@@ -34,10 +33,9 @@ fn main() {
 
     vec5.extend(vec6.drain(..4));
 
-    let mut vec8 = return_vector();
     let mut vec9: std::vec::Vec<u8> = Vec::new();
 
-    vec8.append(&mut vec9);
+    return_vector().append(&mut vec9);
 
     //won't get linted because it is not a vec
 
diff --git a/tests/ui/append_instead_of_extend.stderr b/tests/ui/append_instead_of_extend.stderr
index 8b1ce55e9055..9d309d981def 100644
--- a/tests/ui/append_instead_of_extend.stderr
+++ b/tests/ui/append_instead_of_extend.stderr
@@ -13,10 +13,10 @@ LL |     vec4.extend(vec3.drain(..));
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec4.append(&mut vec3)`
 
 error: use of `extend` instead of `append` for adding the full range of a second vector
-  --> $DIR/append_instead_of_extend.rs:19:5
+  --> $DIR/append_instead_of_extend.rs:18:5
    |
-LL |     vec11.extend(vec10.drain(..));
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec11.append(&mut vec10)`
+LL |     vec11.extend(return_vector().drain(..));
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec11.append(&mut return_vector())`
 
 error: aborting due to 3 previous errors