diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index 527e5dbc22..2507ce10d8 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -793,6 +793,22 @@ function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = fa
 	return $html;
 }
 
+/**
+ * Get the URL of an image attachment.
+ *
+ * @since 4.4.0
+ *
+ * @param int          $attachment_id Image attachment ID.
+ * @param string|array $size          Optional. Registered image size to retrieve the source for or a flat
+ *                                    array of height and width dimensions. Default 'thumbnail'.
+ * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
+ * @return string|false Attachment URL or false if no image is available.
+ */
+function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
+	$image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
+	return isset( $image['0'] ) ? $image['0'] : false;
+}
+
 /**
  * Adds a 'wp-post-image' class to post thumbnails. Internal use only.
  *
diff --git a/tests/phpunit/tests/media.php b/tests/phpunit/tests/media.php
index 34f12813e5..af1c2517b8 100644
--- a/tests/phpunit/tests/media.php
+++ b/tests/phpunit/tests/media.php
@@ -718,4 +718,21 @@ EOF;
 
 		remove_filter( 'embed_maybe_make_link', array( $this, 'filter_wp_embed_shortcode_custom' ), 10 );
 	}
+
+	/**
+	 * @ticket 33878
+	 */
+	function test_wp_get_attachment_image_url() {
+		$this->assertFalse( wp_get_attachment_image_url( 0 ) );
+
+		$post_id = $this->factory->post->create();
+		$attachment_id = $this->factory->attachment->create_object( $this->img_name, $post_id, array(
+			'post_mime_type' => 'image/jpeg',
+			'post_type' => 'attachment',
+		) );
+
+		$image = wp_get_attachment_image_src( $attachment_id, 'thumbnail', false );
+
+		$this->assertEquals( $image[0], wp_get_attachment_image_url( $attachment_id ) );
+	}
 }