diff --git a/autoload/flog/test.vim b/autoload/flog/test.vim
index c61d938..f338c4a 100644
--- a/autoload/flog/test.vim
+++ b/autoload/flog/test.vim
@@ -18,14 +18,12 @@ function! flog#test#ShowNvimBufHl() abort
     endif
     let l:hl_groups = l:line_hl_groups[l:row]
 
-    let l:start_virtcol = virtcol([l:row + 1, l:start_col])
+    let l:start_virtcol = virtcol([l:row + 1, l:start_col]) - 1
     let l:end_virtcol = virtcol([l:row + 1, l:details.end_col]) - 1
 
-    if l:end_virtcol >= l:start_virtcol
-      for l:virtcol in range(l:start_virtcol, l:end_virtcol)
-        let l:hl_groups[l:virtcol] = l:details.hl_group
-      endfor
-    endif
+    for l:virtcol in range(l:start_virtcol, l:end_virtcol)
+      let l:hl_groups[l:virtcol] = l:details.hl_group
+    endfor
   endfor
 
   " Build output