diff --git a/lib/fluent/plugin_helper/cert_option.rb b/lib/fluent/plugin_helper/cert_option.rb
index cb153038c7..197c1393c4 100644
--- a/lib/fluent/plugin_helper/cert_option.rb
+++ b/lib/fluent/plugin_helper/cert_option.rb
@@ -168,7 +168,7 @@ def cert_option_generate_server_pair_self_signed(generate_opts)
 
       def cert_option_certificates_from_file(path)
         data = File.read(path)
-        pattern = Regexp.compile('-+BEGIN CERTIFICATE-+\n(?:[^-]*\n)+-+END CERTIFICATE-+\n', Regexp::MULTILINE)
+        pattern = Regexp.compile('-+BEGIN CERTIFICATE-+\n(?:[^-]*\n)+-+END CERTIFICATE-+\n?', Regexp::MULTILINE)
         list = []
         data.scan(pattern){|match| list << OpenSSL::X509::Certificate.new(match) }
         list
diff --git a/test/plugin_helper/data/cert/cert-key.pem b/test/plugin_helper/data/cert/cert-key.pem
new file mode 100644
index 0000000000..21f41f5c60
--- /dev/null
+++ b/test/plugin_helper/data/cert/cert-key.pem
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/test/plugin_helper/data/cert/cert-with-no-newline.pem b/test/plugin_helper/data/cert/cert-with-no-newline.pem
new file mode 100644
index 0000000000..1624ad0c82
--- /dev/null
+++ b/test/plugin_helper/data/cert/cert-with-no-newline.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/test/plugin_helper/data/cert/cert.pem b/test/plugin_helper/data/cert/cert.pem
new file mode 100644
index 0000000000..d9351650b5
--- /dev/null
+++ b/test/plugin_helper/data/cert/cert.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
diff --git a/test/plugin_helper/test_cert_option.rb b/test/plugin_helper/test_cert_option.rb
new file mode 100644
index 0000000000..e0b0f7dab9
--- /dev/null
+++ b/test/plugin_helper/test_cert_option.rb
@@ -0,0 +1,16 @@
+require_relative '../helper'
+require 'fluent/plugin_helper/cert_option'
+
+class CertOptionPluginHelperTest < Test::Unit::TestCase
+  class Dummy < Fluent::Plugin::TestBase
+    helpers :cert_option
+  end
+
+  test 'can load PEM encoded certificate file' do
+    d = Dummy.new
+    certs = d.cert_option_certificates_from_file("test/plugin_helper/data/cert/cert.pem")
+    assert_equal(1, certs.length)
+    certs = d.cert_option_certificates_from_file("test/plugin_helper/data/cert/cert-with-no-newline.pem")
+    assert_equal(1, certs.length)
+  end
+end