diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 1c4d02702..2b0f40249 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -904,6 +904,8 @@ class EOFError(Exception): ...
 class FloatingPointError(ArithmeticError): ...
 class IOError(EnvironmentError): ...
 class ImportError(Exception): ...
+if sys.version_info >= (3, 6):
+    class ModuleNotFoundError(ImportError): ...
 class IndexError(LookupError): ...
 class KeyError(LookupError): ...
 class MemoryError(Exception): ...