diff --git a/src/services/codefixes/fixUnusedIdentifier.ts b/src/services/codefixes/fixUnusedIdentifier.ts
index bcfcd6d1e6d..69778b543a0 100644
--- a/src/services/codefixes/fixUnusedIdentifier.ts
+++ b/src/services/codefixes/fixUnusedIdentifier.ts
@@ -123,6 +123,9 @@ namespace ts.codefix {
             case SyntaxKind.Parameter:
                 const oldFunction = parent.parent;
                 if (isArrowFunction(oldFunction) && oldFunction.parameters.length === 1) {
+                    // Lambdas with exactly one parameter are special because, after removal, there
+                    // must be an empty parameter list (i.e. `()`) and this won't necessarily be the
+                    // case if the parameter is simply removed (e.g. in `x => 1`).
                     const newFunction = updateArrowFunction(
                         oldFunction,
                         oldFunction.modifiers,
diff --git a/tests/cases/fourslash/unusedParameterInLambda1.ts b/tests/cases/fourslash/unusedParameterInLambda1.ts
index 88a0e8c9272..fdb53a8a05f 100644
--- a/tests/cases/fourslash/unusedParameterInLambda1.ts
+++ b/tests/cases/fourslash/unusedParameterInLambda1.ts
@@ -2,13 +2,11 @@
 
 // @noUnusedLocals: true
 // @noUnusedParameters: true
-//// function f1() {
-////     [|return /*~a*/(/*~b*/x/*~c*/:/*~d*/number/*~e*/)/*~f*/ => /*~g*/{/*~h*/}/*~i*/|]
-//// }
+////[|/*~a*/(/*~b*/x/*~c*/:/*~d*/number/*~e*/)/*~f*/ => /*~g*/{/*~h*/}/*~i*/|]
 
 // In a perfect world, /*~f*/ and /*~h*/ would probably be retained.
 verify.codeFix({
     description: "Remove declaration for: 'x'",
     index: 0,
-    newRangeContent: "return /*~a*/() => /*~g*/ { }/*~i*/",
+    newRangeContent: "/*~a*/() => /*~g*/ { }/*~i*/",
 });
diff --git a/tests/cases/fourslash/unusedParameterInLambda2.ts b/tests/cases/fourslash/unusedParameterInLambda2.ts
index cc46288fe3c..e2b1be346b8 100644
--- a/tests/cases/fourslash/unusedParameterInLambda2.ts
+++ b/tests/cases/fourslash/unusedParameterInLambda2.ts
@@ -2,13 +2,11 @@
 
 // @noUnusedLocals: true
 // @noUnusedParameters: true
-//// function f1() {
-////     [|return /*~a*/x/*~b*/ /*~c*/=>/*~d*/ {/*~e*/}/*~f*/|]
-//// }
+////[|/*~a*/x/*~b*/ /*~c*/=>/*~d*/ {/*~e*/}/*~f*/|]
 
 // In a perfect world, /*~c*/ and /*~e*/ would probably be retained.
 verify.codeFix({
     description: "Remove declaration for: 'x'",
     index: 0,
-    newRangeContent: "return /*~a*/() => /*~d*/ { }/*~f*/",
+    newRangeContent: "/*~a*/() => /*~d*/ { }/*~f*/",
 });
diff --git a/tests/cases/fourslash/unusedParameterInLambda3.ts b/tests/cases/fourslash/unusedParameterInLambda3.ts
index e5f1930eb9d..f95d142d436 100644
--- a/tests/cases/fourslash/unusedParameterInLambda3.ts
+++ b/tests/cases/fourslash/unusedParameterInLambda3.ts
@@ -2,13 +2,11 @@
 
 // @noUnusedLocals: true
 // @noUnusedParameters: true
-//// function f1() {
-////     [|return /*~a*/(/*~b*/x/*~c*/,/*~d*/y/*~e*/)/*~f*/ => /*~g*/x/*~h*/|]
-//// }
+////[|/*~a*/(/*~b*/x/*~c*/,/*~d*/y/*~e*/)/*~f*/ => /*~g*/x/*~h*/|]
 
 // In a perfect world, /*~c*/ would probably be retained, rather than /*~e*/.
 verify.codeFix({
     description: "Remove declaration for: 'y'",
     index: 0,
-    newRangeContent: "return /*~a*/(/*~b*/x/*~e*/)/*~f*/ => /*~g*/x/*~h*/",
+    newRangeContent: "/*~a*/(/*~b*/x/*~e*/)/*~f*/ => /*~g*/x/*~h*/",
 });
diff --git a/tests/cases/fourslash/unusedParameterInLambda4.ts b/tests/cases/fourslash/unusedParameterInLambda4.ts
index c2273ebaad0..015f081891a 100644
--- a/tests/cases/fourslash/unusedParameterInLambda4.ts
+++ b/tests/cases/fourslash/unusedParameterInLambda4.ts
@@ -2,12 +2,10 @@
 
 // @noUnusedLocals: true
 // @noUnusedParameters: true
-//// function f1() {
-////     [|return /*~a*/(/*~b*/x/*~c*/,/*~d*/y/*~e*/)/*~f*/ => /*~g*/y/*~h*/|]
-//// }
+////[|/*~a*/(/*~b*/x/*~c*/,/*~d*/y/*~e*/)/*~f*/ => /*~g*/y/*~h*/|]
 
 verify.codeFix({
     description: "Remove declaration for: 'x'",
     index: 0,
-    newRangeContent: "return /*~a*/(/*~d*/y/*~e*/)/*~f*/ => /*~g*/y/*~h*/",
+    newRangeContent: "/*~a*/(/*~d*/y/*~e*/)/*~f*/ => /*~g*/y/*~h*/",
 });