diff --git a/src/tmuxp/cli/load.py b/src/tmuxp/cli/load.py
index 00dde4e0b1c..e68fdd22902 100644
--- a/src/tmuxp/cli/load.py
+++ b/src/tmuxp/cli/load.py
@@ -626,9 +626,21 @@ def command_load(
         detached = original_detached_option
         new_session_name = original_new_session_name
 
-        if last_idx > 0 and idx < last_idx:
-            detached = True
-            new_session_name = None
+        if last_idx > 0:
+            if idx < last_idx:
+                detached = True
+                new_session_name = None
+            if tmux_options["append"]:
+                original_session_name = None
+                if idx == 0:
+                    original_session_name = (
+                        new_session_name
+                        or config_reader.ConfigReader._from_file(
+                            pathlib.Path(config_file)
+                        )
+                    )
+                elif idx > 0 and original_session_name is not None:
+                    new_session_name = original_session_name
 
         load_workspace(
             workspace_file,
diff --git a/tests/test_cli.py b/tests/test_cli.py
index beb90d98fca..ea413aeaa7a 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -286,6 +286,18 @@ class CLILoadFixture(t.NamedTuple):
         expected_in_out=None,
         expected_not_in_out=None,
     ),
+    CLILoadFixture(
+        test_id="configdir-session-name-double-append",
+        cli_args=["load", "my_config", "second_config", "--append"],
+        config_paths=[
+            "{TMUXP_CONFIGDIR}/my_config.yaml",
+            "{TMUXP_CONFIGDIR}/second_config.yaml",
+        ],
+        session_names=["my_config", "second_config"],
+        expected_exit_code=0,
+        expected_in_out=None,
+        expected_not_in_out=None,
+    ),
 ]
 
 
@@ -355,6 +367,10 @@ def test_load(
     for session_name in session_names:
         assert server.has_session(session_name)
 
+    if "--append" in cli_args:
+        for session_name in session_names[-1:]:
+            assert not server.has_session(session_name)
+
 
 def test_regression_00132_session_name_with_dots(
     tmp_path: pathlib.Path,