diff --git a/src/Valitron/Validator.php b/src/Valitron/Validator.php
index 77305fa..e7e0fe1 100644
--- a/src/Valitron/Validator.php
+++ b/src/Valitron/Validator.php
@@ -246,7 +246,7 @@ class Validator
     {
         if (isset($params[0]) && (bool) $params[0]){
             //strict mode
-            return preg_match('/^-?([0-9])+$/i', $value);
+            return preg_match('/^([0-9]|-[1-9]|-?[1-9][0-9]*)$/i', $value);
         }
 
         return filter_var($value, \FILTER_VALIDATE_INT) !== false;
diff --git a/tests/Valitron/ValidateTest.php b/tests/Valitron/ValidateTest.php
index 6abdf6e..64bc5d8 100644
--- a/tests/Valitron/ValidateTest.php
+++ b/tests/Valitron/ValidateTest.php
@@ -143,11 +143,37 @@ class ValidateTest extends BaseTestCase
         $v->rule('integer', 'num');
         $this->assertTrue($v->validate());
 
-
         $v = new Validator(array('num' => '+41243'));
         $v->rule('integer', 'num', true);
         $this->assertFalse($v->validate());
 
+        $v = new Validator(array('num' => '-1'));
+        $v->rule('integer', 'num', true);
+        $this->assertTrue($v->validate());
+
+        $v = new Validator(array('num' => '-0'));
+        $v->rule('integer', 'num', true);
+        $this->assertFalse($v->validate());
+
+        $v = new Validator(array('num' => '0'));
+        $v->rule('integer', 'num', true);
+        $this->assertTrue($v->validate());
+
+        $v = new Validator(array('num' => '+0'));
+        $v->rule('integer', 'num', true);
+        $this->assertFalse($v->validate());
+
+        $v = new Validator(array('num' => '+1'));
+        $v->rule('integer', 'num', true);
+        $this->assertFalse($v->validate());
+
+        $v = new Validator(array('num' => '0123'));
+        $v->rule('integer', 'num', true);
+        $this->assertFalse($v->validate());
+
+        $v = new Validator(array('num' => '-0123'));
+        $v->rule('integer', 'num', true);
+        $this->assertFalse($v->validate());
     }
 
     public function testIntegerInvalid()
@@ -156,7 +182,6 @@ class ValidateTest extends BaseTestCase
         $v->rule('integer', 'num');
         $this->assertFalse($v->validate());
 
-
         $v = new Validator(array('num' => '--1231'));
         $v->rule('integer', 'num');
         $this->assertFalse($v->validate());