diff --git a/prism_compile.c b/prism_compile.c
index 4d1d0d851f..70faae0e0f 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -2565,6 +2565,7 @@ pm_compile_defined_expr0(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *co
       case PM_REGULAR_EXPRESSION_NODE:
       case PM_RETRY_NODE:
       case PM_RETURN_NODE:
+      case PM_SINGLETON_CLASS_NODE:
       case PM_SOURCE_ENCODING_NODE:
       case PM_SOURCE_FILE_NODE:
       case PM_SOURCE_LINE_NODE:
diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index 63e1a31199..6972938573 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -259,6 +259,7 @@ module Prism
       assert_prism_eval("defined?(1 => 1)")
       assert_prism_eval("defined?(module M; end)")
       assert_prism_eval("defined?(1.2r)")
+      assert_prism_eval("defined?(class << self; end)")
     end
 
     def test_GlobalVariableReadNode