diff --git a/server/src/database/migrations/20201224140829_changes_material_units_constraint.php b/server/src/database/migrations/20201224140829_changes_material_units_constraint.php
new file mode 100644
index 000000000..aaafcfed8
--- /dev/null
+++ b/server/src/database/migrations/20201224140829_changes_material_units_constraint.php
@@ -0,0 +1,31 @@
+<?php
+use Phinx\Migration\AbstractMigration;
+
+class ChangesMaterialUnitsConstraint extends AbstractMigration
+{
+    public function up()
+    {
+        $table = $this->table('event_material_units');
+        $table->dropForeignKey('material_unit_id')->save();
+        $table
+            ->addForeignKey('material_unit_id', 'material_units', 'id', [
+                'delete' => 'CASCADE',
+                'update' => 'NO_ACTION',
+                'constraint' => 'fk_event_material_unit_material_unit',
+            ])
+            ->save();
+    }
+
+    public function down()
+    {
+        $table = $this->table('event_material_units');
+        $table->dropForeignKey('material_unit_id')->save();
+        $table
+            ->addForeignKey('material_unit_id', 'material_units', 'id', [
+                'delete' => 'RESTRICT',
+                'update' => 'NO_ACTION',
+                'constraint' => 'fk_event_material_unit_material_unit',
+            ])
+            ->save();
+    }
+}