diff --git a/migrations/2014_10_28_175710_create_messages_table.php b/migrations/2014_10_28_175710_create_messages_table.php
index afb2e06..301226d 100644
--- a/migrations/2014_10_28_175710_create_messages_table.php
+++ b/migrations/2014_10_28_175710_create_messages_table.php
@@ -17,7 +17,9 @@ public function up()
         Schema::create(Models::table('messages'), function (Blueprint $table) {
             $table->increments('id');
             $table->integer('thread_id')->unsigned();
-            $table->integer('user_id')->unsigned();
+            $table->foreign('thread_id')->references('id')->on('threads');
+            $table->unsignedBigInteger('user_id');
+            $table->foreign('user_id')->references('id')->on('users');
             $table->text('body');
             $table->timestamps();
         });
@@ -33,3 +35,4 @@ public function down()
         Schema::dropIfExists(Models::table('messages'));
     }
 }
+
diff --git a/migrations/2014_10_28_180224_create_participants_table.php b/migrations/2014_10_28_180224_create_participants_table.php
index 227a495..46ec0b3 100644
--- a/migrations/2014_10_28_180224_create_participants_table.php
+++ b/migrations/2014_10_28_180224_create_participants_table.php
@@ -17,7 +17,9 @@ public function up()
         Schema::create(Models::table('participants'), function (Blueprint $table) {
             $table->increments('id');
             $table->integer('thread_id')->unsigned();
-            $table->integer('user_id')->unsigned();
+            $table->foreign('thread_id')->references('id')->on('threads');
+            $table->unsignedBigInteger('user_id');
+            $table->foreign('user_id')->references('id')->on('users');
             $table->timestamp('last_read')->nullable();
             $table->timestamps();
         });