diff --git a/src/wp-includes/rest-api/class-wp-rest-request.php b/src/wp-includes/rest-api/class-wp-rest-request.php
index 74a81c92e8..0a26d0fe3d 100644
--- a/src/wp-includes/rest-api/class-wp-rest-request.php
+++ b/src/wp-includes/rest-api/class-wp-rest-request.php
@@ -286,6 +286,7 @@ class WP_REST_Request implements ArrayAccess {
 	 * @param string $key Header name.
 	 */
 	public function remove_header( $key ) {
+		$key = $this->canonicalize_header_name( $key );
 		unset( $this->headers[ $key ] );
 	}
 
diff --git a/tests/phpunit/tests/rest-api/rest-request.php b/tests/phpunit/tests/rest-api/rest-request.php
index ffd4ea29e7..db876bdb79 100644
--- a/tests/phpunit/tests/rest-api/rest-request.php
+++ b/tests/phpunit/tests/rest-api/rest-request.php
@@ -30,6 +30,14 @@ class Tests_REST_Request extends WP_UnitTestCase {
 		$this->assertNull( $this->request->get_header( 'missing' ) );
 		$this->assertNull( $this->request->get_header_as_array( 'missing' ) );
 	}
+	
+	public function test_remove_header() {
+		$this->request->add_header( 'Test-Header', 'value' );
+		$this->assertEquals( 'value', $this->request->get_header( 'Test-Header' ) );
+		
+		$this->request->remove_header( 'Test-Header' );
+		$this->assertNull( $this->request->get_header( 'Test-Header' ) );
+	}
 
 	public function test_header_multiple() {
 		$value1 = 'application/x-wp-example-1';