diff --git a/dlls/ntdll/sec.c b/dlls/ntdll/sec.c
index eccfc82ce8c..ba11000564e 100644
--- a/dlls/ntdll/sec.c
+++ b/dlls/ntdll/sec.c
@@ -438,7 +438,7 @@ NTSTATUS WINAPI RtlCreateSecurityDescriptor(
 /**************************************************************************
  * RtlCopySecurityDescriptor            [NTDLL.@]
  *
- * Copies an absolute or sefl-relative SECURITY_DESCRIPTOR.
+ * Copies an absolute or self-relative SECURITY_DESCRIPTOR.
  *
  * PARAMS
  *  pSourceSD      [O] SD to copy from.