diff --git a/plugin/sleuth.vim b/plugin/sleuth.vim
index d6695e2..cdff856 100644
--- a/plugin/sleuth.vim
+++ b/plugin/sleuth.vim
@@ -48,7 +48,7 @@ function! s:guess(lines) abort
   if heuristics.hard && !heuristics.spaces
     return {'expandtab': 0, 'shiftwidth': &tabstop}
   elseif heuristics.soft != heuristics.hard
-    let options.expandtab = heuristics.soft > heuristics.spaces
+    let options.expandtab = heuristics.soft > heuristics.hard
     if heuristics.hard
       let options.tabstop = 8
     endif