diff --git a/Rakefile b/Rakefile
index 26efe450..f77585ab 100644
--- a/Rakefile
+++ b/Rakefile
@@ -17,7 +17,7 @@ task test: :spec
 task lint: :rubocop
 
 task :clean do
-  FileUtils.rm_rf File.join(File.dirname(__FILE__), 'tmp/')
-  FileUtils.rm_f Dir.glob(File.join(File.dirname(__FILE__), 'ext/pg_query/*.o'))
-  FileUtils.rm_f File.join(File.dirname(__FILE__), 'lib/pg_query/pg_query.bundle')
+  FileUtils.rm_rf File.join(__dir__, 'tmp/')
+  FileUtils.rm_f Dir.glob(File.join(__dir__, 'ext/pg_query/*.o'))
+  FileUtils.rm_f File.join(__dir__, 'lib/pg_query/pg_query.bundle')
 end
diff --git a/ext/pg_query/extconf.rb b/ext/pg_query/extconf.rb
index 4418a2c5..1d9a70da 100644
--- a/ext/pg_query/extconf.rb
+++ b/ext/pg_query/extconf.rb
@@ -7,7 +7,7 @@
 
 workdir = Dir.pwd
 libdir = File.join(workdir, 'libpg_query-' + LIB_PG_QUERY_TAG)
-gemdir = File.join(File.dirname(__FILE__), '../..')
+gemdir = File.join(__dir__, '../..')
 libfile = libdir + '/libpg_query.a'
 
 unless File.exist?("#{workdir}/libpg_query.tar.gz")
@@ -36,7 +36,7 @@
 $LIBPATH << libdir
 $CFLAGS << " -I #{libdir} -O3 -Wall -fno-strict-aliasing -fwrapv -g"
 
-SYMFILE = File.join(File.dirname(__FILE__), 'pg_query_ruby.sym')
+SYMFILE = File.join(__dir__, 'pg_query_ruby.sym')
 if RUBY_PLATFORM =~ /darwin/
   $DLDFLAGS << " -Wl,-exported_symbols_list #{SYMFILE}" unless defined?(::Rubinius)
 else
diff --git a/spec/lib/fingerprint_spec.rb b/spec/lib/fingerprint_spec.rb
index 43578cca..ac44d420 100644
--- a/spec/lib/fingerprint_spec.rb
+++ b/spec/lib/fingerprint_spec.rb
@@ -25,7 +25,7 @@ def fingerprint_parts(qstr)
 end
 
 def fingerprint_defs
-  @fingerprint_defs ||= JSON.parse File.read(File.join(File.dirname(__FILE__), '../files/fingerprint.json'))
+  @fingerprint_defs ||= JSON.parse File.read(File.join(__dir__, '../files/fingerprint.json'))
 end
 
 describe PgQuery, "#fingerprint" do