diff --git a/src/Roots/Acorn/Application/Concerns/Bootable.php b/src/Roots/Acorn/Application/Concerns/Bootable.php
index c0052b17..9b119916 100644
--- a/src/Roots/Acorn/Application/Concerns/Bootable.php
+++ b/src/Roots/Acorn/Application/Concerns/Bootable.php
@@ -143,7 +143,7 @@ protected function registerDefaultRoute(): void
     {
         Route::any('{any?}', fn () => tap(response(''), function (Response $response) {
             foreach (headers_list() as $header) {
-                [$header, $value] = explode(':', $header, 2);
+                [$header, $value] = preg_split("/:\s{0,1}/", $header, 2);
 
                 if (! headers_sent()) {
                     header_remove($header);