diff --git a/spec/helpers.rb b/spec/helpers.rb
index 2db112e04..606c9d54a 100644
--- a/spec/helpers.rb
+++ b/spec/helpers.rb
@@ -247,6 +247,7 @@ class PostgresServer
 		attr_reader :port
 		attr_reader :conninfo
 		attr_reader :unix_socket
+		attr_reader :pgdata
 
 		### Set up a PostgreSQL database instance for testing.
 		def initialize( name, port: 54321, postgresql_conf: '' )
@@ -254,24 +255,24 @@ def initialize( name, port: 54321, postgresql_conf: '' )
 			@name = name
 			@port = port
 			@test_dir = TEST_DIRECTORY + "tmp_test_#{@name}"
-			@test_pgdata = @test_dir + 'data'
-			@test_pgdata.mkpath
+			@pgdata = @test_dir + 'data'
+			@pgdata.mkpath
 			@pg_bin_dir = nil
 
 			@logfile = @test_dir + 'setup.log'
 			trace "Command output logged to #{@logfile}"
 
 			begin
-				unless (@test_pgdata+"postgresql.conf").exist?
-					FileUtils.rm_rf( @test_pgdata, :verbose => $DEBUG )
+				unless (@pgdata+"postgresql.conf").exist?
+					FileUtils.rm_rf( @pgdata, :verbose => $DEBUG )
 					trace "Running initdb"
-					log_and_run @logfile, pg_bin_path('initdb'), '-E', 'UTF8', '--no-locale', '-D', @test_pgdata.to_s
+					log_and_run @logfile, pg_bin_path('initdb'), '-E', 'UTF8', '--no-locale', '-D', @pgdata.to_s
 				end
 
-				unless (@test_pgdata+"ruby-pg-server-cert").exist?
+				unless (@pgdata+"ruby-pg-server-cert").exist?
 					trace "Enable SSL"
 					# Enable SSL in server config
-					File.open(@test_pgdata+"postgresql.conf", "a+") do |fd|
+					File.open(@pgdata+"postgresql.conf", "a+") do |fd|
 						fd.puts <<-EOT
 ssl = on
 ssl_ca_file = 'ruby-pg-ca-cert'
@@ -282,8 +283,8 @@ def initialize( name, port: 54321, postgresql_conf: '' )
 					end
 
 					# Enable MD5 authentication in hba config
-					hba_content = File.read(@test_pgdata+"pg_hba.conf")
-					File.open(@test_pgdata+"pg_hba.conf", "w") do |fd|
+					hba_content = File.read(@pgdata+"pg_hba.conf")
+					File.open(@pgdata+"pg_hba.conf", "w") do |fd|
 						fd.puts <<-EOT
 # TYPE  DATABASE     USER              ADDRESS             METHOD
 host    all          testusermd5       ::1/128             md5
@@ -292,17 +293,17 @@ def initialize( name, port: 54321, postgresql_conf: '' )
 					end
 
 					trace "Generate certificates"
-					generate_ssl_certs(@test_pgdata.to_s)
+					generate_ssl_certs(@pgdata.to_s)
 				end
 
 				trace "Starting postgres"
 				sopt = "-p #{@port}"
 				sopt += " -k #{@test_dir.to_s.dump}" unless RUBY_PLATFORM=~/mingw|mswin/i
 				log_and_run @logfile, pg_bin_path('pg_ctl'), '-w', '-o', sopt,
-					'-D', @test_pgdata.to_s, 'start'
+					'-D', @pgdata.to_s, 'start'
 				sleep 2
 
-				td = @test_pgdata
+				td = @pgdata
 				@conninfo = "host=localhost port=#{@port} dbname=test sslrootcert=#{td + 'ruby-pg-ca-cert'} sslcert=#{td + 'ruby-pg-client-cert'} sslkey=#{td + 'ruby-pg-client-key'}"
 				@unix_socket = @test_dir.to_s
 			rescue => err
@@ -350,7 +351,7 @@ def connect
 		def teardown
 			trace "Tearing down test database for #{@name}"
 
-			log_and_run @logfile, pg_bin_path('pg_ctl'), '-D', @test_pgdata.to_s, '-m', 'fast', 'stop'
+			log_and_run @logfile, pg_bin_path('pg_ctl'), '-D', @pgdata.to_s, '-m', 'fast', 'stop'
 		end
 
 		def pg_bin_path(cmd)
diff --git a/spec/pg/connection_spec.rb b/spec/pg/connection_spec.rb
index fcc277b50..47f4399e9 100644
--- a/spec/pg/connection_spec.rb
+++ b/spec/pg/connection_spec.rb
@@ -567,7 +567,7 @@
 			# Connect with SSL, but use a wrong client cert, so that connection is aborted.
 			# A second connection is then started with a new IO.
 			# And since the pipes above were freed in the concurrent thread above, there is a high chance that it's a lower file descriptor than before.
-			conn = PG.connect( @conninfo + " sslcert=tmp_test_specs/data/ruby-pg-ca-cert" )
+			conn = PG.connect( @conninfo + " sslcert=#{$pg_server.pgdata}/ruby-pg-ca-cert" )
 			expect( conn.ssl_in_use? ).to be_falsey
 
 			# The new connection should work even when the file descriptor has changed.
@@ -585,7 +585,7 @@
 					Thread.new do
 						Thread.current.report_on_exception = false
 						expect do
-							threaded_conn = PG.connect( @conninfo + " sslcert=tmp_test_specs/data/ruby-pg-ca-cert" )
+							threaded_conn = PG.connect( @conninfo + " sslcert=#{$pg_server.pgdata}/ruby-pg-ca-cert" )
 							threaded_conn.exec("SELECT 1")
 							threaded_conn.close
 						end.not_to raise_error