diff --git a/data/migrations/Version20171021093246.php b/data/migrations/Version20171021093246.php
index a9c39ebb..d0aff69b 100644
--- a/data/migrations/Version20171021093246.php
+++ b/data/migrations/Version20171021093246.php
@@ -20,6 +20,10 @@ class Version20171021093246 extends AbstractMigration
     public function up(Schema $schema)
     {
         $shortUrls = $schema->getTable('short_urls');
+        if ($shortUrls->hasColumn('value_since')) {
+            return;
+        }
+
         $shortUrls->addColumn('valid_since', Type::DATETIME, [
             'notnull' => false,
         ]);
@@ -35,6 +39,10 @@ class Version20171021093246 extends AbstractMigration
     public function down(Schema $schema)
     {
         $shortUrls = $schema->getTable('short_urls');
+        if (! $shortUrls->hasColumn('value_since')) {
+            return;
+        }
+
         $shortUrls->dropColumn('valid_since');
         $shortUrls->dropColumn('valid_until');
     }
diff --git a/data/migrations/Version20171022064541.php b/data/migrations/Version20171022064541.php
index bac05c61..ef0447aa 100644
--- a/data/migrations/Version20171022064541.php
+++ b/data/migrations/Version20171022064541.php
@@ -20,6 +20,10 @@ class Version20171022064541 extends AbstractMigration
     public function up(Schema $schema)
     {
         $shortUrls = $schema->getTable('short_urls');
+        if ($shortUrls->hasColumn('max_visits')) {
+            return;
+        }
+
         $shortUrls->addColumn('max_visits', Type::INTEGER, [
             'unsigned' => true,
             'notnull' => false,
@@ -33,6 +37,10 @@ class Version20171022064541 extends AbstractMigration
     public function down(Schema $schema)
     {
         $shortUrls = $schema->getTable('short_urls');
+        if (! $shortUrls->hasColumn('max_visits')) {
+            return;
+        }
+
         $shortUrls->dropColumn('max_visits');
     }
 }