diff --git a/lark-stubs/lark.pyi b/lark-stubs/lark.pyi
index d28a8a0..8f373e8 100644
--- a/lark-stubs/lark.pyi
+++ b/lark-stubs/lark.pyi
@@ -50,7 +50,7 @@ class FromPackageLoader:
 
 class Lark:
     source_path: str
-    source_code: str
+    source_grammar: str
     options: LarkOptions
     lexer: Lexer
     terminals: List[TerminalDef]
@@ -75,7 +75,7 @@ class Lark:
         g_regex_flags: int = ...,
         use_bytes: bool = False,
         import_paths: List[Union[str, Callable[[Union[None, str, PackageResource], str], Tuple[str, str]]]] = ...,
-        source_path: Optional[str],
+        source_path: Optional[str]=None,
     ):
         ...
 
diff --git a/lark/lark.py b/lark/lark.py
index 8107e34..f53ac37 100644
--- a/lark/lark.py
+++ b/lark/lark.py
@@ -213,7 +213,7 @@ class Lark(Serialize):
             grammar = read()
 
         assert isinstance(grammar, STRING_TYPE)
-        self.source_code = grammar
+        self.source_grammar = grammar
         if self.options.use_bytes:
             if not isascii(grammar):
                 raise ValueError("Grammar must be ascii only, when use_bytes=True")