diff --git a/Changelog.draft.rst b/Changelog.draft.rst
index d9977a2..e754f50 100644
--- a/Changelog.draft.rst
+++ b/Changelog.draft.rst
@@ -21,6 +21,7 @@ Bug Fixes
 
 * Fix regression (UIBase is no more).
 
+* Make profiling mode really enforce single-threading
 
 Pending for the next major release
 ==================================
diff --git a/offlineimap/init.py b/offlineimap/init.py
index 232de25..8aebb23 100644
--- a/offlineimap/init.py
+++ b/offlineimap/init.py
@@ -169,7 +169,7 @@ class OfflineImap:
         if options.profiledir:
             if not options.singlethreading:
                 logging.warn("Profile mode: Forcing to singlethreaded.")
-                options.singlethreaded = True
+                options.singlethreading = True
             profiledir = options.profiledir
             os.mkdir(profiledir)
             threadutil.setprofiledir(profiledir)