diff --git a/harness/harness-common.rb b/harness/harness-common.rb
index 6fd0e888..2d9ceb74 100644
--- a/harness/harness-common.rb
+++ b/harness/harness-common.rb
@@ -136,7 +136,7 @@ def get_maxrss
 end
 
 # Do expand_path at require-time, not when returning results, before the benchmark is likely to chdir
-default_path = "data/results-#{RUBY_ENGINE}-#{RUBY_ENGINE_VERSION}-#{Time.now.strftime('%F-%H%M%S')}.json"
+default_path = File.expand_path("../data/results-#{RUBY_ENGINE}-#{RUBY_ENGINE_VERSION}-#{Time.now.strftime('%F-%H%M%S')}.json", __dir__)
 yb_env_var = ENV.fetch("RESULT_JSON_PATH", default_path)
 YB_OUTPUT_FILE = File.expand_path yb_env_var
 
diff --git a/harness/harness.rb b/harness/harness.rb
index 8e660296..7c3b79a4 100644
--- a/harness/harness.rb
+++ b/harness/harness.rb
@@ -9,7 +9,7 @@
 # Minimum benchmarking time in seconds
 MIN_BENCH_TIME = Integer(ENV.fetch('MIN_BENCH_TIME', 10))
 
-default_path = "data/results-#{RUBY_ENGINE}-#{RUBY_ENGINE_VERSION}-#{Time.now.strftime('%F-%H%M%S')}.csv"
+default_path = File.expand_path("../data/results-#{RUBY_ENGINE}-#{RUBY_ENGINE_VERSION}-#{Time.now.strftime('%F-%H%M%S')}.csv", __dir__)
 OUT_CSV_PATH = File.expand_path(ENV.fetch('OUT_CSV_PATH', default_path))
 
 RSS_CSV_PATH = ENV['RSS_CSV_PATH'] ? File.expand_path(ENV['RSS_CSV_PATH']) : nil