diff --git a/lib/sprockets/rails/sourcemapping_url_processor.rb b/lib/sprockets/rails/sourcemapping_url_processor.rb
index fe8a29cc..25745bfa 100644
--- a/lib/sprockets/rails/sourcemapping_url_processor.rb
+++ b/lib/sprockets/rails/sourcemapping_url_processor.rb
@@ -2,21 +2,25 @@ 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)/
+      FILE_REGEX = /\/\/# sourceMappingURL=(.*\.map)/
+      INLINE_REGEX = /\/\/# sourceMappingURL=(data:.*)$/
 
       class << self
         def call(input)
           env     = input[:environment]
           context = env.context_class.new(input)
-          data    = input[:data].gsub(REGEX) do |_match|
+          data    = input[:data].gsub(FILE_REGEX) do |_match|
             sourcemap_logical_path = combine_sourcemap_logical_path(sourcefile: input[:name], sourcemap: $1)
 
             begin
-              resolved_sourcemap_comment(sourcemap_logical_path, context: context)
+              resolved_sourcemap_file_comment(sourcemap_logical_path, context: context)
             rescue Sprockets::FileNotFound
-              removed_sourcemap_comment(sourcemap_logical_path, filename: input[:filename], env: env)
+              removed_sourcemap_file_comment(sourcemap_logical_path, filename: input[:filename], env: env)
             end
           end
+          data    = data.gsub(INLINE_REGEX) do |_match|
+            "//# sourceMappingURL=#{$1}\n//!\n"
+          end
 
           { data: data }
         end
@@ -30,7 +34,7 @@ def combine_sourcemap_logical_path(sourcefile:, sourcemap:)
             end
           end
 
-          def resolved_sourcemap_comment(sourcemap_logical_path, context:)
+          def resolved_sourcemap_file_comment(sourcemap_logical_path, context:)
             "//# sourceMappingURL=#{sourcemap_asset_path(sourcemap_logical_path, context: context)}\n//!\n"
           end
 
@@ -44,7 +48,7 @@ def sourcemap_asset_path(sourcemap_logical_path, context:)
             end
           end
 
-          def removed_sourcemap_comment(sourcemap_logical_path, filename:, env:)
+          def removed_sourcemap_file_comment(sourcemap_logical_path, filename:, env:)
             env.logger.warn "Removed sourceMappingURL comment for missing asset '#{sourcemap_logical_path}' from #{filename}"
             nil
           end
diff --git a/test/test_sourcemapping_url_processor.rb b/test/test_sourcemapping_url_processor.rb
index ead7c33a..9882c111 100644
--- a/test/test_sourcemapping_url_processor.rb
+++ b/test/test_sourcemapping_url_processor.rb
@@ -46,4 +46,16 @@ def resolve(path, **kargs)
     output = Sprockets::Rails::SourcemappingUrlProcessor.call(input)
     assert_equal({ data: "var mapped;\n" }, output)
   end
+
+  def test_inline_successful
+    @env.context_class.class_eval do
+      def resolve(path, **kargs)
+        "/assets/mapped.js.map"
+      end
+    end
+
+    input = { environment: @env, data: "var mapped;\n//# sourceMappingURL=data:application/json;base64,abc123=", name: 'mapped', filename: 'mapped.js', metadata: {} }
+    output = Sprockets::Rails::SourcemappingUrlProcessor.call(input)
+    assert_equal({ data: "var mapped;\n//# sourceMappingURL=data:application/json;base64,abc123=\n//!\n" }, output)
+  end
 end