diff --git a/__tests__/pesel.spec.ts b/__tests__/pesel.spec.ts
index 7243f80..0516e58 100644
--- a/__tests__/pesel.spec.ts
+++ b/__tests__/pesel.spec.ts
@@ -10,6 +10,7 @@ describe('pesel', () => {
         ;[...validMales, ...validFemales].forEach((peselNumber) => {
             it(`using ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.isValid).toEqual(true)
             })
         })
@@ -19,6 +20,7 @@ describe('pesel', () => {
         ;[...invalidMales, ...invalidFemales].forEach((peselNumber) => {
             it(`using ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.isValid).toEqual(false)
             })
         })
@@ -28,6 +30,7 @@ describe('pesel', () => {
         validMales.forEach((peselNumber) => {
             it(`using valid ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.getGender()).toEqual('male')
             })
         })
@@ -35,6 +38,7 @@ describe('pesel', () => {
         invalidMales.forEach((peselNumber) => {
             it(`using invalid ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.getGender()).toEqual('male')
             })
         })
@@ -44,12 +48,14 @@ describe('pesel', () => {
         validFemales.forEach((peselNumber) => {
             it(`using valid ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.getGender()).toEqual('female')
             })
         })
         invalidFemales.forEach((peselNumber) => {
             it(`using valid ${peselNumber}`, () => {
                 const pesel = new PESEL(peselNumber)
+
                 expect(pesel.getGender()).toEqual('female')
             })
         })
diff --git a/src/nip/index.ts b/src/nip/index.ts
index 60a5cd7..dcb7d3f 100644
--- a/src/nip/index.ts
+++ b/src/nip/index.ts
@@ -1,5 +1,6 @@
 export class NIP {
     private readonly valid: boolean
+
     private readonly nip: string
 
     constructor(nip: string) {
@@ -23,10 +24,7 @@ export class NIP {
         const weights = [6, 5, 7, 2, 3, 4, 5, 6, 7]
         const digits = `${this.nip}`.split('').map((digit) => +digit)
         const lastDigit = digits.splice(-1)[0]
-        const control = weights.reduce(
-            (previous, current, index) => previous + current * digits[index],
-            0
-        )
+        const control = weights.reduce((previous, current, index) => previous + current * digits[index], 0)
 
         return control % 11 === lastDigit
     }
diff --git a/src/pesel/index.ts b/src/pesel/index.ts
index 07aa445..dade092 100644
--- a/src/pesel/index.ts
+++ b/src/pesel/index.ts
@@ -62,9 +62,7 @@ export class PESEL {
         const weights = [1, 3, 7, 9]
         const digits = `${this.pesel}`.split('').map((digit) => +digit)
         const lastDigit = digits.splice(-1)[0]
-        const control =
-            digits.reduce((previous, current, index) => previous + current * weights[index % 4]) %
-            10
+        const control = digits.reduce((previous, current, index) => previous + current * weights[index % 4]) % 10
 
         return 10 - (control === 0 ? 10 : control) === lastDigit
     }