diff --git a/lib/sass/gem_package_importer.rb b/lib/sass/gem_package_importer.rb
index b0b0eee2..fc27f0fd 100644
--- a/lib/sass/gem_package_importer.rb
+++ b/lib/sass/gem_package_importer.rb
@@ -7,10 +7,10 @@ class GemPackageImporter
     def find_file_url(url, _canonicalize_context)
       return unless url.start_with?('pkg:')
 
-      library, _, path = url[4..].partition('/')
+      library, _, path = url[4..].partition(/[?#]/).first.partition('/')
       gem_dir = Gem::Dependency.new(library).to_spec.gem_dir
 
-      "file://#{'/' unless gem_dir.start_with?('/')}#{gem_dir}/#{path}"
+      "file://#{'/' unless gem_dir.start_with?('/')}#{gem_dir.gsub(/[?#]/, { '?' => '%3F', '#' => '%23' })}/#{path}"
     rescue Gem::MissingSpecError
       nil
     end