autoload/lsp/completion.vim | 2 +-

diff --git a/autoload/lsp/completion.vim b/autoload/lsp/completion.vim
index fe9799d02c71ef71d362ea21ab6abb4df3777588..65ad42bfdad7eb50819007858fb718693e06e574 100644
--- a/autoload/lsp/completion.vim
+++ b/autoload/lsp/completion.vim
@@ -90,7 +90,7 @@   endif
 
   # Get the keyword prefix before the current cursor column.
   var chcol = charcol('.')
-  var starttext = getline('.')[ : chcol - 1]
+  var starttext = getline('.')[ : chcol - 2]
   var [prefix, start_idx, end_idx] = starttext->tolower()->matchstrpos('\k*$')
   var start_col = start_idx + 1