diff --git a/benchmark/assert/deepequal-buffer.js b/benchmark/assert/deepequal-buffer.js
index d4495af69b48ef..0e7494544d3387 100644
--- a/benchmark/assert/deepequal-buffer.js
+++ b/benchmark/assert/deepequal-buffer.js
@@ -13,9 +13,7 @@ const bench = common.createBenchmark(main, {
   ]
 });
 
-function main(conf) {
-  const n = +conf.n;
-  const len = +conf.len;
+function main({ len, n, method }) {
   var i;
 
   const data = Buffer.allocUnsafe(len + 1);
@@ -26,7 +24,7 @@ function main(conf) {
   data.copy(expected);
   data.copy(expectedWrong);
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
diff --git a/benchmark/assert/deepequal-map.js b/benchmark/assert/deepequal-map.js
index 4976f2619834bf..085274e8bfb943 100644
--- a/benchmark/assert/deepequal-map.js
+++ b/benchmark/assert/deepequal-map.js
@@ -38,14 +38,11 @@ function benchmark(method, n, values, values2) {
   bench.end(n);
 }
 
-function main(conf) {
-  const n = +conf.n;
-  const len = +conf.len;
-
+function main({ n, len, method }) {
   const array = Array(len).fill(1);
   var values, values2;
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_primitiveOnly':
diff --git a/benchmark/assert/deepequal-object.js b/benchmark/assert/deepequal-object.js
index 4ad3704408384d..2c2549d58485fc 100644
--- a/benchmark/assert/deepequal-object.js
+++ b/benchmark/assert/deepequal-object.js
@@ -25,10 +25,9 @@ function createObj(source, add = '') {
   }));
 }
 
-function main(conf) {
-  const size = conf.size;
-  // TODO: Fix this "hack"
-  const n = conf.n / size;
+function main({ size, n, method }) {
+  // TODO: Fix this "hack". `n` should not be manipulated.
+  n = n / size;
   var i;
 
   const source = Array.apply(null, Array(size));
@@ -36,7 +35,7 @@ function main(conf) {
   const expected = createObj(source);
   const expectedWrong = createObj(source, '4');
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
diff --git a/benchmark/assert/deepequal-prims-and-objs-big-array-set.js b/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
index 19337d7828236d..04802a76928cb2 100644
--- a/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
+++ b/benchmark/assert/deepequal-prims-and-objs-big-array-set.js
@@ -15,7 +15,7 @@ const primValues = {
 };
 
 const bench = common.createBenchmark(main, {
-  prim: Object.keys(primValues),
+  primitive: Object.keys(primValues),
   n: [25],
   len: [1e5],
   method: [
@@ -30,10 +30,8 @@ const bench = common.createBenchmark(main, {
   ]
 });
 
-function main(conf) {
-  const prim = primValues[conf.prim];
-  const n = +conf.n;
-  const len = +conf.len;
+function main({ n, len, primitive, method }) {
+  const prim = primValues[primitive];
   const actual = [];
   const expected = [];
   const expectedWrong = [];
@@ -52,7 +50,7 @@ function main(conf) {
   const expectedSet = new Set(expected);
   const expectedWrongSet = new Set(expectedWrong);
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_Array':
diff --git a/benchmark/assert/deepequal-prims-and-objs-big-loop.js b/benchmark/assert/deepequal-prims-and-objs-big-loop.js
index 4a345f27c20f0e..09797dfaf2df21 100644
--- a/benchmark/assert/deepequal-prims-and-objs-big-loop.js
+++ b/benchmark/assert/deepequal-prims-and-objs-big-loop.js
@@ -14,7 +14,7 @@ const primValues = {
 };
 
 const bench = common.createBenchmark(main, {
-  prim: Object.keys(primValues),
+  primitive: Object.keys(primValues),
   n: [1e6],
   method: [
     'deepEqual',
@@ -24,16 +24,15 @@ const bench = common.createBenchmark(main, {
   ]
 });
 
-function main(conf) {
-  const prim = primValues[conf.prim];
-  const n = +conf.n;
+function main({ n, primitive, method }) {
+  const prim = primValues[primitive];
   const actual = prim;
   const expected = prim;
   const expectedWrong = 'b';
   var i;
 
   // Creates new array to avoid loop invariant code motion
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
diff --git a/benchmark/assert/deepequal-set.js b/benchmark/assert/deepequal-set.js
index aa0ebc064886a2..ebcf33cc6d5254 100644
--- a/benchmark/assert/deepequal-set.js
+++ b/benchmark/assert/deepequal-set.js
@@ -38,15 +38,12 @@ function benchmark(method, n, values, values2) {
   bench.end(n);
 }
 
-function main(conf) {
-  const n = +conf.n;
-  const len = +conf.len;
-
+function main({ n, len, method }) {
   const array = Array(len).fill(1);
 
   var values, values2;
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual_primitiveOnly':
diff --git a/benchmark/assert/deepequal-typedarrays.js b/benchmark/assert/deepequal-typedarrays.js
index 8e8cc4b083a73e..01546801ff3004 100644
--- a/benchmark/assert/deepequal-typedarrays.js
+++ b/benchmark/assert/deepequal-typedarrays.js
@@ -24,12 +24,8 @@ const bench = common.createBenchmark(main, {
   len: [1e6]
 });
 
-function main(conf) {
-  const type = conf.type;
+function main({ type, n, len, method }) {
   const clazz = global[type];
-  const n = +conf.n;
-  const len = +conf.len;
-
   const actual = new clazz(len);
   const expected = new clazz(len);
   const expectedWrong = Buffer.alloc(len);
@@ -37,7 +33,7 @@ function main(conf) {
   expectedWrong[wrongIndex] = 123;
   var i;
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'deepEqual':
diff --git a/benchmark/assert/throws.js b/benchmark/assert/throws.js
index 075e227f886acc..bffde7cbc1fd94 100644
--- a/benchmark/assert/throws.js
+++ b/benchmark/assert/throws.js
@@ -13,15 +13,14 @@ const bench = common.createBenchmark(main, {
   ]
 });
 
-function main(conf) {
-  const n = +conf.n;
+function main({ n, method }) {
   const throws = () => { throw new TypeError('foobar'); };
   const doesNotThrow = () => { return 'foobar'; };
   const regExp = /foobar/;
   const message = 'failure';
   var i;
 
-  switch (conf.method) {
+  switch (method) {
     case '':
       // Empty string falls through to next line as default, mostly for tests.
     case 'doesNotThrow':
@@ -54,6 +53,6 @@ function main(conf) {
       bench.end(n);
       break;
     default:
-      throw new Error(`Unsupported method ${conf.method}`);
+      throw new Error(`Unsupported method ${method}`);
   }
 }