diff --git a/lua/neogruber/groups.lua b/lua/neogruber/groups.lua
index 83eade8..897022d 100644
--- a/lua/neogruber/groups.lua
+++ b/lua/neogruber/groups.lua
@@ -354,7 +354,7 @@ M.setup = function()
 		-- Virtual text "Error"
 		LspDiagnosticsVirtualTextError = { fg = c.red1 },
 		-- used to underline "Error" diagnostics.
-		LspDiagnosticsUnderlineError = {},
+		LspDiagnosticsUnderlineError = { underline = config.underline },
 		-- used for "Warning" diagnostic signs in sign column
 		LspDiagnosticsDefaultWarning = { fg = c.red_1 },
 		-- used for "Warning" diagnostic signs in sign column
@@ -364,7 +364,7 @@ M.setup = function()
 		-- Virtual text "Warning"
 		LspDiagnosticsVirtualTextWarning = { fg = c.red_1 },
 		-- used to underline "Warning" diagnostics.
-		LspDiagnosticsUnderlineWarning = {},
+		LspDiagnosticsUnderlineWarning = { underline = config.underline },
 		-- used for "Information" diagnostic virtual text
 		LspDiagnosticsDefaultInformation = { fg = c.yellow },
 		-- used for "Information" diagnostic signs in sign column