diff --git a/data/migrations/Version20201023090929.php b/data/migrations/Version20201023090929.php
new file mode 100644
index 00000000..49a401ba
--- /dev/null
+++ b/data/migrations/Version20201023090929.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\DBAL\Types\Types;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20201023090929 extends AbstractMigration
+{
+    private const IMPORT_SOURCE_COLUMN = 'import_source';
+
+    public function up(Schema $schema): void
+    {
+        $shortUrls = $schema->getTable('short_urls');
+        $this->skipIf($shortUrls->hasColumn(self::IMPORT_SOURCE_COLUMN));
+
+        $shortUrls->addColumn(self::IMPORT_SOURCE_COLUMN, Types::STRING, [
+            'length' => 255,
+            'notnull' => false,
+        ]);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $shortUrls = $schema->getTable('short_urls');
+        $this->skipIf(! $shortUrls->hasColumn(self::IMPORT_SOURCE_COLUMN));
+
+        $shortUrls->dropColumn(self::IMPORT_SOURCE_COLUMN);
+    }
+}
diff --git a/module/Core/config/entities-mappings/Shlinkio.Shlink.Core.Entity.ShortUrl.php b/module/Core/config/entities-mappings/Shlinkio.Shlink.Core.Entity.ShortUrl.php
index 871ac113..55fa230e 100644
--- a/module/Core/config/entities-mappings/Shlinkio.Shlink.Core.Entity.ShortUrl.php
+++ b/module/Core/config/entities-mappings/Shlinkio.Shlink.Core.Entity.ShortUrl.php
@@ -51,6 +51,11 @@ return static function (ClassMetadata $metadata, array $emConfig): void {
             ->nullable()
             ->build();
 
+    $builder->createField('importSource', Types::STRING)
+            ->columnName('import_source')
+            ->nullable()
+            ->build();
+
     $builder->createOneToMany('visits', Entity\Visit::class)
             ->mappedBy('shortUrl')
             ->fetchExtraLazy()
diff --git a/module/Core/src/Entity/ShortUrl.php b/module/Core/src/Entity/ShortUrl.php
index 6da6562a..34883127 100644
--- a/module/Core/src/Entity/ShortUrl.php
+++ b/module/Core/src/Entity/ShortUrl.php
@@ -35,7 +35,7 @@ class ShortUrl extends AbstractEntity
     private ?Domain $domain = null;
     private bool $customSlugWasProvided;
     private int $shortCodeLength;
-    private ?string $source = null;
+    private ?string $importSource = null;
 
     public function __construct(
         string $longUrl,
@@ -72,7 +72,7 @@ class ShortUrl extends AbstractEntity
         }
 
         $instance = new self($url->longUrl(), ShortUrlMeta::fromRawData($meta), $domainResolver);
-        $instance->source = $source;
+        $instance->importSource = $source;
         $instance->dateCreated = Chronos::instance($url->createdAt());
 
         return $instance;