diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index cface7d72..47871fa92 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -919,6 +919,12 @@ class Coder:
 
         return platform_text
 
+    def get_system_info(self):
+        system_info = self.get_platform_info()
+        if self.chat_language:
+            system_info += f"- Chat language: {self.chat_language}\n"
+        return system_info
+
     def fmt_system_prompt(self, prompt):
         lazy_prompt = self.gpt_prompts.lazy_prompt if self.main_model.lazy else ""
         platform_text = self.get_platform_info()
diff --git a/tests/basic/test_main.py b/tests/basic/test_main.py
index 96949910b..310b8e457 100644
--- a/tests/basic/test_main.py
+++ b/tests/basic/test_main.py
@@ -628,7 +628,8 @@ class TestMain(TestCase):
                 output=DummyOutput(),
                 return_coder=True,
             )
-            self.assertIn("Spanish", coder.get_system_info())
+            system_info = coder.get_system_info()
+            self.assertIn("Chat language: Spanish", system_info)
 
     @patch("git.Repo.init")
     def test_main_exit_with_git_command_not_found(self, mock_git_init):