diff --git a/src/asserts/big-number-assert.js b/src/asserts/big-number-assert.js
index ff8ea92..ba136c5 100644
--- a/src/asserts/big-number-assert.js
+++ b/src/asserts/big-number-assert.js
@@ -25,8 +25,6 @@ module.exports = function bigNumberAssert({ validateSignificantDigits = true } =
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Class name.
    */
@@ -38,6 +36,10 @@ module.exports = function bigNumberAssert({ validateSignificantDigits = true } =
    */
 
   this.validate = value => {
+    const originalDebug = BigNumber.DEBUG;
+
+    BigNumber.DEBUG = !!validateSignificantDigits;
+
     try {
       const number = new BigNumber(value);
 
@@ -50,6 +52,8 @@ module.exports = function bigNumberAssert({ validateSignificantDigits = true } =
       }
 
       throw new Violation(this, value);
+    } finally {
+      BigNumber.DEBUG = originalDebug;
     }
 
     return true;
diff --git a/src/asserts/big-number-equal-to-assert.js b/src/asserts/big-number-equal-to-assert.js
index aad3ea6..fa7bf9a 100644
--- a/src/asserts/big-number-equal-to-assert.js
+++ b/src/asserts/big-number-equal-to-assert.js
@@ -27,8 +27,6 @@ module.exports = function bigNumberEqualToAssert(value, { validateSignificantDig
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Extend `Assert` with `BigNumberAssert`.
    */
diff --git a/src/asserts/big-number-greater-than-assert.js b/src/asserts/big-number-greater-than-assert.js
index b3adfb5..f534b63 100644
--- a/src/asserts/big-number-greater-than-assert.js
+++ b/src/asserts/big-number-greater-than-assert.js
@@ -27,8 +27,6 @@ module.exports = function bigNumberGreaterThanAssert(threshold, { validateSignif
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Extend `Assert` with `BigNumberAssert`.
    */
diff --git a/src/asserts/big-number-greater-than-or-equal-to-assert.js b/src/asserts/big-number-greater-than-or-equal-to-assert.js
index 23cf26c..fff3977 100644
--- a/src/asserts/big-number-greater-than-or-equal-to-assert.js
+++ b/src/asserts/big-number-greater-than-or-equal-to-assert.js
@@ -27,8 +27,6 @@ module.exports = function bigNumberGreaterThanOrEqualToAssert(threshold, { valid
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Extend `Assert` with `BigNumberAssert`.
    */
diff --git a/src/asserts/big-number-less-than-assert.js b/src/asserts/big-number-less-than-assert.js
index 8235198..af6f82e 100644
--- a/src/asserts/big-number-less-than-assert.js
+++ b/src/asserts/big-number-less-than-assert.js
@@ -27,8 +27,6 @@ module.exports = function bigNumberLessThan(threshold, { validateSignificantDigi
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Extend `Assert` with `BigNumberAssert`.
    */
diff --git a/src/asserts/big-number-less-than-or-equal-to-assert.js b/src/asserts/big-number-less-than-or-equal-to-assert.js
index 615d63e..76ccda1 100644
--- a/src/asserts/big-number-less-than-or-equal-to-assert.js
+++ b/src/asserts/big-number-less-than-or-equal-to-assert.js
@@ -27,8 +27,6 @@ module.exports = function bigNumberLessThanOrEqualToAssert(threshold, { validate
     throw new Error('BigNumber is not installed');
   }
 
-  BigNumber.DEBUG = !!validateSignificantDigits;
-
   /**
    * Extend `Assert` with `BigNumberAssert`.
    */
diff --git a/test/asserts/big-number-assert.test.js b/test/asserts/big-number-assert.test.js
index 5e04bb0..46ee8ed 100644
--- a/test/asserts/big-number-assert.test.js
+++ b/test/asserts/big-number-assert.test.js
@@ -91,4 +91,36 @@ describe('BigNumberAssert', () => {
       }
     });
   });
+
+  it('should restore the original BigNumber.DEBUG value after validation', ({ assert }) => {
+    const BigNumber = require('bignumber.js');
+
+    BigNumber.DEBUG = false;
+
+    Assert.bigNumber({ validateSignificantDigits: true }).validate('1.01');
+
+    assert.equal(BigNumber.DEBUG, false);
+
+    BigNumber.DEBUG = true;
+
+    Assert.bigNumber({ validateSignificantDigits: false }).validate('1.01');
+
+    assert.equal(BigNumber.DEBUG, true);
+  });
+
+  it('should restore the original BigNumber.DEBUG value even when validation fails', ({ assert }) => {
+    const BigNumber = require('bignumber.js');
+
+    BigNumber.DEBUG = false;
+
+    try {
+      Assert.bigNumber({ validateSignificantDigits: true }).validate('invalid');
+
+      assert.fail();
+    } catch (e) {
+      assert.ok(e instanceof Violation);
+    }
+
+    assert.equal(BigNumber.DEBUG, false);
+  });
 });
diff --git a/test/regression/big-number-debug.test.js b/test/regression/big-number-debug.test.js
new file mode 100644
index 0000000..3d983ae
--- /dev/null
+++ b/test/regression/big-number-debug.test.js
@@ -0,0 +1,118 @@
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+const { Assert: BaseAssert, Violation } = require('validator.js');
+const { describe, it } = require('node:test');
+const BigNumber = require('bignumber.js');
+const BigNumberEqualToAssert = require('../../src/asserts/big-number-equal-to-assert.js');
+const BigNumberGreaterThanAssert = require('../../src/asserts/big-number-greater-than-assert.js');
+const BigNumberGreaterThanOrEqualToAssert = require('../../src/asserts/big-number-greater-than-or-equal-to-assert.js');
+const BigNumberLessThanAssert = require('../../src/asserts/big-number-less-than-assert.js');
+const BigNumberLessThanOrEqualToAssert = require('../../src/asserts/big-number-less-than-or-equal-to-assert.js');
+
+/**
+ * Extend `Assert` with all BigNumber asserts.
+ */
+
+const Assert = BaseAssert.extend({
+  BigNumberEqualTo: BigNumberEqualToAssert,
+  BigNumberGreaterThan: BigNumberGreaterThanAssert,
+  BigNumberGreaterThanOrEqualTo: BigNumberGreaterThanOrEqualToAssert,
+  BigNumberLessThan: BigNumberLessThanAssert,
+  BigNumberLessThanOrEqualTo: BigNumberLessThanOrEqualToAssert
+});
+
+/**
+ * Test BigNumber asserts regression - BigNumber.DEBUG preservation.
+ */
+
+describe('BigNumber DEBUG Regression', () => {
+  const asserts = [
+    {
+      constructor: options => Assert.bigNumberEqualTo(10, options),
+      invalidValue: 5,
+      name: 'BigNumberEqualTo',
+      validValue: 10
+    },
+    {
+      constructor: options => Assert.bigNumberGreaterThan(10, options),
+      invalidValue: 5,
+      name: 'BigNumberGreaterThan',
+      validValue: 11
+    },
+    {
+      constructor: options => Assert.bigNumberGreaterThanOrEqualTo(10, options),
+      invalidValue: 5,
+      name: 'BigNumberGreaterThanOrEqualTo',
+      validValue: 10
+    },
+    {
+      constructor: options => Assert.bigNumberLessThan(10, options),
+      invalidValue: 15,
+      name: 'BigNumberLessThan',
+      validValue: 9
+    },
+    {
+      constructor: options => Assert.bigNumberLessThanOrEqualTo(10, options),
+      invalidValue: 15,
+      name: 'BigNumberLessThanOrEqualTo',
+      validValue: 10
+    }
+  ];
+
+  const debugValues = [true, false];
+  const validateSignificantDigitsOptions = [true, false];
+
+  asserts.forEach(({ constructor, invalidValue, name, validValue }) => {
+    describe(name, () => {
+      debugValues.forEach(initialDebugValue => {
+        validateSignificantDigitsOptions.forEach(validateSignificantDigits => {
+          describe(`with DEBUG=${initialDebugValue} and validateSignificantDigits=${validateSignificantDigits}`, () => {
+            it('should restore original BigNumber.DEBUG value after successful validation', ({ assert }) => {
+              BigNumber.DEBUG = initialDebugValue;
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+
+              constructor({ validateSignificantDigits }).validate(validValue);
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+            });
+
+            it('should restore original BigNumber.DEBUG value after failed validation', ({ assert }) => {
+              BigNumber.DEBUG = initialDebugValue;
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+
+              try {
+                constructor({ validateSignificantDigits }).validate(invalidValue);
+                assert.fail();
+              } catch (e) {
+                assert.ok(e instanceof Violation);
+              }
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+            });
+
+            it('should restore original BigNumber.DEBUG value after validation with invalid input', ({ assert }) => {
+              BigNumber.DEBUG = initialDebugValue;
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+
+              try {
+                constructor({ validateSignificantDigits }).validate('invalid');
+                assert.fail();
+              } catch (e) {
+                assert.ok(e instanceof Violation);
+              }
+
+              assert.equal(BigNumber.DEBUG, initialDebugValue);
+            });
+          });
+        });
+      });
+    });
+  });
+});