diff --git a/tests/FunctionalResolverTest.php b/tests/FunctionalResolverTest.php
index 9cb05615..c19de631 100644
--- a/tests/FunctionalResolverTest.php
+++ b/tests/FunctionalResolverTest.php
@@ -9,6 +9,9 @@
 
 class FunctionalResolverTest extends TestCase
 {
+    private $loop;
+    private $resolver;
+
     /**
      * @before
      */
diff --git a/tests/Protocol/ParserTest.php b/tests/Protocol/ParserTest.php
index 0624526a..7cf9cbe7 100644
--- a/tests/Protocol/ParserTest.php
+++ b/tests/Protocol/ParserTest.php
@@ -8,6 +8,8 @@
 
 class ParserTest extends TestCase
 {
+    private $parser;
+
     /**
      * @before
      */
diff --git a/tests/Query/SelectiveTransportExecutorTest.php b/tests/Query/SelectiveTransportExecutorTest.php
index a6cf29e0..9e0e0c84 100644
--- a/tests/Query/SelectiveTransportExecutorTest.php
+++ b/tests/Query/SelectiveTransportExecutorTest.php
@@ -11,6 +11,10 @@
 
 class SelectiveTransportExecutorTest extends TestCase
 {
+    private $datagram;
+    private $stream;
+    private $executor;
+
     /**
      * @before
      */