diff --git a/src/Iterators/CsvIterator.php b/src/Iterators/CsvIterator.php
index 16b5697c..d6621e22 100644
--- a/src/Iterators/CsvIterator.php
+++ b/src/Iterators/CsvIterator.php
@@ -20,6 +20,9 @@ public function __construct($filePath)
         $this->filePath = $filePath;
     }
 
+    /**
+     * @deprecated use setColumns instead
+     */
     public function parseColumns($columns): self
     {
         $this->columns = $columns;
@@ -27,14 +30,21 @@ public function parseColumns($columns): self
         return $this;
     }
 
+    public function setColumns($columns): self
+    {
+        $this->columns = $columns;
+
+        return $this;
+    }
+
     public function rewind(): void
     {
         fclose($this->file);
 
         $this->file = fopen($this->filePath, 'r');
-
-        $this->currentCsvLine = fgetcsv($this->file);
         $this->currentRow = 0;
+
+        $this->next();
     }
 
     public function current(): array
@@ -54,6 +64,12 @@ public function getGenerator(): Generator
     {
         $this->rewind();
 
+        if (empty($this->columns)) {
+            $this->columns = $this->currentCsvLine;
+
+            $this->next();
+        }
+
         while ($this->valid()) {
             $line = $this->current();
 
diff --git a/tests/CsvIteratorTest.php b/tests/CsvIteratorTest.php
index 1bd191e4..4e1d5d4a 100644
--- a/tests/CsvIteratorTest.php
+++ b/tests/CsvIteratorTest.php
@@ -10,6 +10,7 @@ class CsvIteratorTest extends HelpersTestCase
 {
     protected CsvIterator $csvIteratorClass;
     protected ReflectionProperty $columnsProperty;
+    protected ReflectionProperty $filePathProperty;
 
     public function setUp(): void
     {
@@ -19,6 +20,9 @@ public function setUp(): void
 
         $this->columnsProperty = new ReflectionProperty(CsvIterator::class, 'columns');
         $this->columnsProperty->setAccessible(true);
+
+        $this->filePathProperty = new ReflectionProperty(CsvIterator::class, 'filePath');
+        $this->filePathProperty->setAccessible(true);
     }
 
     public function testOpenNotExistsFile()
@@ -40,6 +44,17 @@ public function testParseColumns()
         $this->assertEquals($header, $actualHeader);
     }
 
+    public function testSetColumns()
+    {
+        $header = $this->getJsonFixture('header.json');
+
+        $this->csvIteratorClass->setColumns($header);
+
+        $actualHeader = $this->columnsProperty->getValue($this->csvIteratorClass);
+
+        $this->assertEquals($header, $actualHeader);
+    }
+
     public function testCurrent()
     {
         $currentLine = $this->csvIteratorClass->current();
@@ -73,11 +88,11 @@ public function testRewind()
         $rowKey = $this->csvIteratorClass->key();
         $currentLine = $this->csvIteratorClass->current();
 
-        $this->assertEquals(0, $rowKey);
+        $this->assertEquals(1, $rowKey);
         $this->assertEqualsFixture('current_after_next_line.json', $currentLine);
     }
 
-    public function testGenerator()
+    public function testGeneratorWithoutSettingColumnHeaders()
     {
         $result = [];
         $generator = $this->csvIteratorClass->getGenerator();
@@ -88,16 +103,17 @@ public function testGenerator()
 
         $rowKey = $this->csvIteratorClass->key();
 
-        $this->assertEquals(6, $rowKey);
+        $this->assertEquals(7, $rowKey);
         $this->assertEqualsFixture('all_data.json', $result);
     }
 
-    public function testGeneratorWithHeader()
+    public function testGeneratorWithSettingColumnHeaders()
     {
         $result = [];
         $header = $this->getJsonFixture('header.json');
 
-        $this->csvIteratorClass->parseColumns($header);
+        $this->filePathProperty->setValue($this->csvIteratorClass, $this->getFixturePath('addresses_without_header.csv'));
+        $this->csvIteratorClass->setColumns($header);
 
         $generator = $this->csvIteratorClass->getGenerator();
 
@@ -108,7 +124,7 @@ public function testGeneratorWithHeader()
         $rowKey = $this->csvIteratorClass->key();
 
         $this->assertEquals(6, $rowKey);
-        $this->assertEqualsFixture('all_data_with_header.json', $result);
+        $this->assertEqualsFixture('all_data.json', $result);
     }
 
     public function testGeneratorWithHeadersInvalidCount()
@@ -118,7 +134,7 @@ public function testGeneratorWithHeadersInvalidCount()
 
         $header = $this->getJsonFixture('header_invalid_count.json');
 
-        $this->csvIteratorClass->parseColumns($header);
+        $this->csvIteratorClass->setColumns($header);
 
         $generator = $this->csvIteratorClass->getGenerator();
 
diff --git a/tests/fixtures/CsvIteratorTest/addresses_without_header.csv b/tests/fixtures/CsvIteratorTest/addresses_without_header.csv
new file mode 100644
index 00000000..c29646ec
--- /dev/null
+++ b/tests/fixtures/CsvIteratorTest/addresses_without_header.csv
@@ -0,0 +1,5 @@
+John,Doe,120 jefferson st.,Riverside, NJ, 08075
+Jack,McGinnis,220 hobo Av.,Phila, PA,09119
+"John ""Da Man""",Repici,120 Jefferson St.,Riverside, NJ,08075
+Stephen,Tyler,"7452 Terrace ""At the Plaza"" road",SomeTown,SD, 91234
+"Joan ""the bone"", Anne",Jet,"9th, at Terrace plc",Desert City,CO,00123
\ No newline at end of file
diff --git a/tests/fixtures/CsvIteratorTest/all_data.json b/tests/fixtures/CsvIteratorTest/all_data.json
index 2a12076c..c9c403cd 100644
--- a/tests/fixtures/CsvIteratorTest/all_data.json
+++ b/tests/fixtures/CsvIteratorTest/all_data.json
@@ -1,50 +1,42 @@
 [
-    [
-        "First Name",
-        "Last Name",
-        "Address",
-        "City",
-        "State",
-        "Zip"
-    ],
-    [
-        "John",
-        "Doe",
-        "120 jefferson st.",
-        "Riverside",
-        " NJ",
-        " 08075"
-    ],
-    [
-        "Jack",
-        "McGinnis",
-        "220 hobo Av.",
-        "Phila",
-        " PA",
-        "09119"
-    ],
-    [
-        "John \"Da Man\"",
-        "Repici",
-        "120 Jefferson St.",
-        "Riverside",
-        " NJ",
-        "08075"
-    ],
-    [
-        "Stephen",
-        "Tyler",
-        "7452 Terrace \"At the Plaza\" road",
-        "SomeTown",
-        "SD",
-        " 91234"
-    ],
-    [
-        "Joan \"the bone\", Anne",
-        "Jet",
-        "9th, at Terrace plc",
-        "Desert City",
-        "CO",
-        "00123"
-    ]
+    {
+        "First Name": "John",
+        "Last Name": "Doe",
+        "Address": "120 jefferson st.",
+        "City": "Riverside",
+        "State": " NJ",
+        "Zip": " 08075"
+    },
+    {
+        "First Name": "Jack",
+        "Last Name": "McGinnis",
+        "Address": "220 hobo Av.",
+        "City": "Phila",
+        "State": " PA",
+        "Zip": "09119"
+    },
+    {
+        "First Name": "John \"Da Man\"",
+        "Last Name": "Repici",
+        "Address": "120 Jefferson St.",
+        "City": "Riverside",
+        "State": " NJ",
+        "Zip": "08075"
+    },
+    {
+        "First Name": "Stephen",
+        "Last Name": "Tyler",
+        "Address": "7452 Terrace \"At the Plaza\" road",
+        "City": "SomeTown",
+        "State": "SD",
+        "Zip": " 91234"
+    },
+    {
+        "First Name": "Joan \"the bone\", Anne",
+        "Last Name": "Jet",
+        "Address": "9th, at Terrace plc",
+        "City": "Desert City",
+        "State": "CO",
+        "Zip": "00123"
+    }
 ]
\ No newline at end of file
diff --git a/tests/fixtures/CsvIteratorTest/all_data_with_header.json b/tests/fixtures/CsvIteratorTest/all_data_with_header.json
deleted file mode 100644
index a4bfcce5..00000000
--- a/tests/fixtures/CsvIteratorTest/all_data_with_header.json
+++ /dev/null
@@ -1,50 +0,0 @@
-[
-    {
-        "First Name": "First Name",
-        "Last Name": "Last Name",
-        "Address": "Address",
-        "City": "City",
-        "State": "State",
-        "Zip": "Zip"
-    },
-    {
-        "First Name": "John",
-        "Last Name": "Doe",
-        "Address": "120 jefferson st.",
-        "City": "Riverside",
-        "State": " NJ",
-        "Zip": " 08075"
-    },
-    {
-        "First Name": "Jack",
-        "Last Name": "McGinnis",
-        "Address": "220 hobo Av.",
-        "City": "Phila",
-        "State": " PA",
-        "Zip": "09119"
-    },
-    {
-        "First Name": "John \"Da Man\"",
-        "Last Name": "Repici",
-        "Address": "120 Jefferson St.",
-        "City": "Riverside",
-        "State": " NJ",
-        "Zip": "08075"
-    },
-    {
-        "First Name": "Stephen",
-        "Last Name": "Tyler",
-        "Address": "7452 Terrace \"At the Plaza\" road",
-        "City": "SomeTown",
-        "State": "SD",
-        "Zip": " 91234"
-    },
-    {
-        "First Name": "Joan \"the bone\", Anne",
-        "Last Name": "Jet",
-        "Address": "9th, at Terrace plc",
-        "City": "Desert City",
-        "State": "CO",
-        "Zip": "00123"
-    }
-]
\ No newline at end of file