diff --git a/lib/sprockets/rails/sourcemapping_url_processor.rb b/lib/sprockets/rails/sourcemapping_url_processor.rb
index fe8a29cc..1564a02d 100644
--- a/lib/sprockets/rails/sourcemapping_url_processor.rb
+++ b/lib/sprockets/rails/sourcemapping_url_processor.rb
@@ -2,7 +2,7 @@ module Sprockets
   module Rails
     # Rewrites source mapping urls with the digested paths and protect against semicolon appending with a dummy comment line
     class SourcemappingUrlProcessor
-      REGEX = /\/\/# sourceMappingURL=(.*\.map)/
+      REGEX = /\/\/# sourceMappingURL=(?:.*\/)?(.*\.map)/
 
       class << self
         def call(input)
diff --git a/test/test_sourcemapping_url_processor.rb b/test/test_sourcemapping_url_processor.rb
index ead7c33a..33fbfb78 100644
--- a/test/test_sourcemapping_url_processor.rb
+++ b/test/test_sourcemapping_url_processor.rb
@@ -23,6 +23,26 @@ def asset_path(path, options = {})
     assert_equal({ data: "var mapped;\n//# sourceMappingURL=/assets/mapped-HEXGOESHERE.js.map\n//!\n" }, output)
   end
 
+  def test_removing_path_prefix
+    @env.context_class.class_eval do
+      def resolve(path, **kargs)
+        if path == 'mapped.js.map'
+          "/assets/mapped.js.map"
+        else
+          raise Sprockets::FileNotFound
+        end
+      end
+
+      def asset_path(path, options = {})
+        "/assets/mapped-HEXGOESHERE.js.map"
+      end
+    end
+
+    input = { environment: @env, data: "var mapped;\n//# sourceMappingURL=/some/prefix/mapped.js.map", name: 'mapped', filename: 'mapped.js', metadata: {} }
+    output = Sprockets::Rails::SourcemappingUrlProcessor.call(input)
+    assert_equal({ data: "var mapped;\n//# sourceMappingURL=/assets/mapped-HEXGOESHERE.js.map\n//!\n" }, output)
+  end
+
   def test_resolving_erroneously_without_map_extension
     @env.context_class.class_eval do
       def resolve(path, **kargs)