diff --git a/lua/astrobox/highlights/modules/syntax.lua b/lua/astrobox/highlights/modules/syntax.lua
index 28ce3d9..5ef7864 100644
--- a/lua/astrobox/highlights/modules/syntax.lua
+++ b/lua/astrobox/highlights/modules/syntax.lua
@@ -42,10 +42,10 @@ return function(theme, palette)
         DiagnosticHint = theme.msg.hint,
         DiagnosticInfo = theme.msg.info,
         DiagnosticWarn = theme.msg.warning,
-        DiagnosticUnderlineError = { sp = palette.red, undercurl = true },
-        DiagnosticUnderlineHint = { sp = palette.aqua, undercurl = true },
-        DiagnosticUnderlineInfo = { sp = palette.blue, undercurl = true },
-        DiagnosticUnderlineWarn = { sp = palette.yellow, undercurl = true },
+        DiagnosticUnderlineError = { sp = palette.red, bg = palette.colored_backgrounds.red },
+        DiagnosticUnderlineHint = { sp = palette.aqua, bg = palette.colored_backgrounds.aqua },
+        DiagnosticUnderlineInfo = { sp = palette.blue, bg = palette.colored_backgrounds.blue },
+        DiagnosticUnderlineWarn = { sp = palette.yellow, bg = palette.colored_backgrounds.yellow },
         LspInlayHint = theme.conceal,
         LspCodeLens = { link = "LspInlayHint" },
         LspCodeLensSeparator = { link = "LspCodeLens" },