diff --git a/aider/utils.py b/aider/utils.py
index d1cbccd13..d0a8e5130 100644
--- a/aider/utils.py
+++ b/aider/utils.py
@@ -282,7 +282,7 @@ def check_pip_install_extra(io, module, prompt, pip_install_cmd):
     cmd = get_pip_install(pip_install_cmd)
 
     io.tool_error(prompt)
-    if not io.confirm_ask("Run pip install?", default="y", subject=' '.join(cmd)):
+    if not io.confirm_ask("Run pip install?", default="y", subject=" ".join(cmd)):
         return
 
     success, output = run_install(cmd)
diff --git a/aider/versioncheck.py b/aider/versioncheck.py
index e0ae78c50..3f69aeb6f 100644
--- a/aider/versioncheck.py
+++ b/aider/versioncheck.py
@@ -71,7 +71,7 @@ Newer aider version v{latest_version} is available. To upgrade, run:
     text = f"Newer aider version v{latest_version} is available. To upgrade, run:"
 
     io.tool_error(text)
-    if io.confirm_ask("Run pip install?", subject=' '.join(cmd)):
+    if io.confirm_ask("Run pip install?", subject=" ".join(cmd)):
         success, output = utils.run_install(cmd)
         if success:
             io.tool_output("Re-run aider to use new version.")