diff --git a/lib/propshaft/compiler/css_asset_urls.rb b/lib/propshaft/compiler/css_asset_urls.rb
index 5e9a737..c2c68c0 100644
--- a/lib/propshaft/compiler/css_asset_urls.rb
+++ b/lib/propshaft/compiler/css_asset_urls.rb
@@ -3,7 +3,7 @@
 require "propshaft/compiler"
 
 class Propshaft::Compiler::CssAssetUrls < Propshaft::Compiler
-  ASSET_URL_PATTERN = /url\(\s*["']?(?!(?:\#|%23|data|http|\/\/))([^"'\s?#)]+)([#?][^"')]+)?\s*["']?\)/
+  ASSET_URL_PATTERN = /url\(\s*["']?(?!(?:\#|%23|data:|http:|https:|\/\/))([^"'\s?#)]+)([#?][^"')]+)?\s*["']?\)/
 
   def compile(asset, input)
     input.gsub(ASSET_URL_PATTERN) { asset_url resolve_path(asset.logical_path.dirname, $1), asset.logical_path, $2, $1 }
diff --git a/test/fixtures/assets/vendor/foobar/source/database.jpg b/test/fixtures/assets/vendor/foobar/source/database.jpg
new file mode 100644
index 0000000..5aa9c1e
Binary files /dev/null and b/test/fixtures/assets/vendor/foobar/source/database.jpg differ
diff --git a/test/fixtures/assets/vendor/foobar/source/http-diagram.jpg b/test/fixtures/assets/vendor/foobar/source/http-diagram.jpg
new file mode 100644
index 0000000..5aa9c1e
Binary files /dev/null and b/test/fixtures/assets/vendor/foobar/source/http-diagram.jpg differ
diff --git a/test/propshaft/compiler/css_asset_urls_test.rb b/test/propshaft/compiler/css_asset_urls_test.rb
index 3b672ad..41e6980 100644
--- a/test/propshaft/compiler/css_asset_urls_test.rb
+++ b/test/propshaft/compiler/css_asset_urls_test.rb
@@ -76,6 +76,9 @@ class Propshaft::Compiler::CssAssetUrlsTest < ActiveSupport::TestCase
   test "url" do
     compiled = compile_asset_with_content(%({ background: url('https://rubyonrails.org/images/rails-logo.svg'); }))
     assert_match "{ background: url('https://rubyonrails.org/images/rails-logo.svg'); }", compiled
+
+    compiled = compile_asset_with_content(%({ background: url(http-diagram.jpg); }))
+    assert_match(/{ background: url\("\/assets\/foobar\/source\/http-diagram-[a-z0-9]{8}.jpg"\); }/, compiled)
   end
 
   test "relative protocol url" do
@@ -86,6 +89,9 @@ class Propshaft::Compiler::CssAssetUrlsTest < ActiveSupport::TestCase
   test "data" do
     compiled = compile_asset_with_content(%({ background: url(data:image/png;base64,iRxVB0); }))
     assert_match "{ background: url(data:image/png;base64,iRxVB0); }", compiled
+
+    compiled = compile_asset_with_content(%({ background: url(database.jpg); }))
+    assert_match(/{ background: url\("\/assets\/foobar\/source\/database-[a-z0-9]{8}.jpg"\); }/, compiled)
   end
 
   test "anchor" do