diff --git a/tests/fixtures/mock_mcp.json b/tests/fixtures/mock_mcp.json
index 51aebf7..e4b3202 100644
--- a/tests/fixtures/mock_mcp.json
+++ b/tests/fixtures/mock_mcp.json
@@ -2,7 +2,7 @@
     "servers": {
         "mock_server": {
             "command": "python3",
-            "args": ["tests/fixtures/mock_mcp_server.py"],
+            "args": ["-u", "tests/fixtures/mock_mcp_server.py"],
             "enabled": true
         },
         "disabled_server": {
@@ -12,7 +12,7 @@
         },
         "echo_server": {
             "command": "python3",
-            "args": ["tests/fixtures/echo_server.py"],
+            "args": ["-u", "tests/fixtures/echo_server.py"],
             "enabled": true
         }
     }