diff --git a/lib/simplecov-json.rb b/lib/simplecov-json.rb
index 4214c2f..3fdd6b7 100644
--- a/lib/simplecov-json.rb
+++ b/lib/simplecov-json.rb
@@ -10,10 +10,14 @@ class SimpleCov::Formatter::JSONFormatter
     data[:files] = []
     result.files.each do |sourceFile|
       next unless result.filenames.include? sourceFile.filename
+
+      # Compatible with older versions of simplecov.
+      coverage_data = (defined? sourceFile.coverage) ? sourceFile.coverage : sourceFile.coverage_data
+
       data[:files] << {
         filename: sourceFile.filename,
         covered_percent: sourceFile.covered_percent,
-        coverage: sourceFile.coverage_data,
+        coverage: coverage_data,
         covered_strength: sourceFile.covered_strength.nan? ? 0.0 : sourceFile.covered_strength, 
         covered_lines: sourceFile.covered_lines.count, 
         lines_of_code: sourceFile.lines_of_code, 
diff --git a/simplecov-json.gemspec b/simplecov-json.gemspec
index fe92736..9d3adfc 100644
--- a/simplecov-json.gemspec
+++ b/simplecov-json.gemspec
@@ -3,7 +3,7 @@ $:.push File.expand_path("../lib", __FILE__)
 
 Gem::Specification.new do |s|
   s.name        = "simplecov-json"
-  s.version     = '0.2.1'
+  s.version     = '0.2.2'
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["Vicent Llongo"]
   s.email       = ["villosil@gmail.com"]