diff --git a/README.md b/README.md
index 35db8b1..1320563 100644
--- a/README.md
+++ b/README.md
@@ -100,6 +100,12 @@ let g:space_before_virtual_text = 5
 let g:diagnostic_show_sign = 0
 ```
 
+- The default priority of the diagnostic sign is 20. You can customize it by
+
+```vim
+let g:diagnostic_sign_priority = 20
+```
+
 - Make sure to use the latest branch of Neovim which has sign support.
 
 - If you want to change the symbols of sign, use `sign_define` to change it
diff --git a/lua/diagnostic.lua b/lua/diagnostic.lua
index 2565704..99995ae 100644
--- a/lua/diagnostic.lua
+++ b/lua/diagnostic.lua
@@ -77,7 +77,7 @@ function M.publish_diagnostics(bufnr)
   util.buf_diagnostics_save_positions(bufnr, result.diagnostics)
   vim.lsp.util.buf_diagnostics_underline(bufnr, result.diagnostics)
   if vim.api.nvim_get_var('diagnostic_show_sign') == 1 then
-    vim.lsp.util.buf_diagnostics_signs(bufnr, result.diagnostics)
+    util.buf_diagnostics_signs(bufnr, result.diagnostics)
   end
   if vim.api.nvim_get_var('diagnostic_enable_virtual_text') == 1 then
     util.buf_diagnostics_virtual_text(bufnr, result.diagnostics)
diff --git a/lua/diagnostic/util.lua b/lua/diagnostic/util.lua
index ac180ef..977efdc 100644
--- a/lua/diagnostic/util.lua
+++ b/lua/diagnostic/util.lua
@@ -103,11 +103,6 @@ function M.buf_diagnostics_virtual_text(bufnr, diagnostics)
 end
 
 function M.buf_diagnostics_signs(bufnr, diagnostics)
-  vim.fn.sign_define('LspDiagnosticsErrorSign', {text=vim.g['LspDiagnosticsErrorSign'] or 'E', texthl='LspDiagnosticsError', linehl='', numhl=''})
-  vim.fn.sign_define('LspDiagnosticsWarningSign', {text=vim.g['LspDiagnosticsWarningSign'] or 'W', texthl='LspDiagnosticsWarning', linehl='', numhl=''})
-  vim.fn.sign_define('LspDiagnosticsInformationSign', {text=vim.g['LspDiagnosticsInformationSign'] or 'I', texthl='LspDiagnosticsInformation', linehl='', numhl=''})
-  vim.fn.sign_define('LspDiagnosticsHintSign', {text=vim.g['LspDiagnosticsHintSign'] or 'H', texthl='LspDiagnosticsHint', linehl='', numhl=''})
-
   for _, diagnostic in ipairs(diagnostics) do
     local diagnostic_severity_map = {
       [protocol.DiagnosticSeverity.Error] = "LspDiagnosticsErrorSign";
@@ -115,7 +110,7 @@ function M.buf_diagnostics_signs(bufnr, diagnostics)
       [protocol.DiagnosticSeverity.Information] = "LspDiagnosticsInformationSign";
       [protocol.DiagnosticSeverity.Hint] = "LspDiagnosticsHintSign";
     }
-    vim.fn.sign_place(0, sign_ns, diagnostic_severity_map[diagnostic.severity], bufnr, {lnum=(diagnostic.range.start.line+1), priority=50})
+    vim.fn.sign_place(0, sign_ns, diagnostic_severity_map[diagnostic.severity], bufnr, {lnum=(diagnostic.range.start.line+1), priority=vim.g.diagnostic_sign_priority})
   end
 end
 
diff --git a/plugin/diagnostic.vim b/plugin/diagnostic.vim
index 0a69b8f..68776b0 100644
--- a/plugin/diagnostic.vim
+++ b/plugin/diagnostic.vim
@@ -31,6 +31,10 @@ if ! exists('g:diagnostic_show_sign')
     let g:diagnostic_show_sign = 1
 endif
 
+if ! exists('g:diagnostic_sign_priority')
+    let g:diagnostic_sign_priority = 20
+endif
+
 if ! exists('g:diagnostic_insert_delay')
     let g:diagnostic_insert_delay = 0
 endif