diff --git a/Rules b/Rules
index 001e3788f..3b5d968cb 100644
--- a/Rules
+++ b/Rules
@@ -35,9 +35,7 @@ Nanoc::Tidy
 
 ##
 # See packages/typescript/postman
-compile "/css/vendor/postman.scss" do
-  filter :sass, syntax: :scss, style: :compact
-  filter :rainpress
+compile "/css/vendor/postman.css" do
   write("/css/vendor/postman.css")
 end
 
diff --git a/nanoc/lib/utils/inline.rb b/nanoc/lib/utils/inline.rb
index 68d0efd05..7678bd84a 100644
--- a/nanoc/lib/utils/inline.rb
+++ b/nanoc/lib/utils/inline.rb
@@ -4,7 +4,7 @@ module Utils::Inline
   def inline_css(path)
     class_name = File.basename(path, File.extname(path))
     %|<style class="css #{class_name}">| \
-    "#{items[path.sub(".css", ".scss")].compiled_content}" \
+    "#{items[path].compiled_content}" \
     "</style>"
   end
 end
diff --git a/src/css/vendor/postman.scss b/src/css/vendor/postman.css
similarity index 100%
rename from src/css/vendor/postman.scss
rename to src/css/vendor/postman.css