diff --git a/lib/better_errors/error_page.rb b/lib/better_errors/error_page.rb
index afb28f0d..e0cc90a3 100644
--- a/lib/better_errors/error_page.rb
+++ b/lib/better_errors/error_page.rb
@@ -120,7 +120,7 @@ def rails_params
     end
 
     def uri_prefix
-      env["SCRIPT_NAME"] || ""
+      BetterErrors::Middleware.internal_url_prefix + (env["SCRIPT_NAME"] || "")
     end
 
     def request_path
diff --git a/lib/better_errors/middleware.rb b/lib/better_errors/middleware.rb
index 34b5efa7..70284ae7 100644
--- a/lib/better_errors/middleware.rb
+++ b/lib/better_errors/middleware.rb
@@ -42,6 +42,14 @@ def self.allow_ip!(addr)
 
     CSRF_TOKEN_COOKIE_NAME = "BetterErrors-#{BetterErrors::VERSION}-CSRF-Token"
 
+    def self.internal_url_prefix
+      @internal_url_prefix || ""
+    end
+
+    def self.internal_url_prefix=(value)
+      @internal_url_prefix = value
+    end
+
     # A new instance of BetterErrors::Middleware
     #
     # @param app      The Rack app/middleware to wrap with Better Errors