diff --git a/fixtures/self_referencing_class.php b/fixtures/self_referencing_class.php
new file mode 100644
index 0000000..287fc25
--- /dev/null
+++ b/fixtures/self_referencing_class.php
@@ -0,0 +1,4 @@
+<?php
+class C extends C {}
+$c = new C;
+$c->undef_prop = 1;
\ No newline at end of file
diff --git a/src/DefinitionResolver.php b/src/DefinitionResolver.php
index 990c196..163000f 100644
--- a/src/DefinitionResolver.php
+++ b/src/DefinitionResolver.php
@@ -452,7 +452,9 @@ class DefinitionResolver
             // Repeat for parent class
             if ($implementorDef->extends) {
                 foreach ($implementorDef->extends as $extends) {
-                    $implementorFqns[] = $extends;
+                    if ($extends !== $implementorFqn) {
+                        $implementorFqns[] = $extends;
+                    }
                 }
             }
         }