autoload/lsp/completion.vim | 4 ++--

diff --git a/autoload/lsp/completion.vim b/autoload/lsp/completion.vim
index ef16da42e0abfd08baaafc9ccc5007e474a3a4fa..d0d24513fb9b9b1cbe7fafc59254e9fcb2e9585e 100644
--- a/autoload/lsp/completion.vim
+++ b/autoload/lsp/completion.vim
@@ -106,8 +106,8 @@       # Remove all the snippet placeholders
       d.word = MakeValidWord(d.word)
     else
       # plain text completion.  If the completion item text doesn't start with
-      # the current keyword prefix, skip it.
-      if prefix != '' && stridx(d.word, prefix) != 0
+      # the current (case ignored) keyword prefix, skip it.
+      if prefix != '' && d.word !~? $'^{prefix}'
 	continue
       endif
     endif