diff --git a/lib/connection/netio.rb b/lib/connection/netio.rb
index 602767d..acb0112 100644
--- a/lib/connection/netio.rb
+++ b/lib/connection/netio.rb
@@ -368,7 +368,7 @@ def open_ssl_socket()
               fl = @ssl.ts_files.split(",")
               fl.each do |fn|
                 # Add next cert file listed
-                raise Stomp::Error::SSLNoTruststoreFileError if !File::exists?(fn)
+                raise Stomp::Error::SSLNoTruststoreFileError if !File::exist?(fn)
                 raise Stomp::Error::SSLUnreadableTruststoreFileError if !File::readable?(fn)
                 truststores.add_file(fn)
               end
@@ -386,7 +386,7 @@ def open_ssl_socket()
             raise Stomp::Error::SSLClientParamsError if !@ssl.cert_file.nil? &&
               @ssl.key_file.nil? && @ssl.key_text.nil?
             if @ssl.cert_file
-              raise Stomp::Error::SSLNoCertFileError if !File::exists?(@ssl.cert_file)
+              raise Stomp::Error::SSLNoCertFileError if !File::exist?(@ssl.cert_file)
               raise Stomp::Error::SSLUnreadableCertFileError if !File::readable?(@ssl.cert_file)
               p [ "OSSL51", "old code cert file read" ] if ossdbg
               usecert = OpenSSL::X509::Certificate.new(File.read(@ssl.cert_file))
@@ -403,7 +403,7 @@ def open_ssl_socket()
             raise Stomp::Error::SSLClientParamsError if !@ssl.key_text.nil? &&
               !@ssl.key_file.nil?
             if @ssl.key_file
-              raise Stomp::Error::SSLNoKeyFileError if !File::exists?(@ssl.key_file)
+              raise Stomp::Error::SSLNoKeyFileError if !File::exist?(@ssl.key_file)
               raise Stomp::Error::SSLUnreadableKeyFileError if !File::readable?(@ssl.key_file)
               p [ "OSSL53", "old code key file read" ] if ossdbg
               usekey  = OpenSSL::PKey::RSA.new(File.read(@ssl.key_file), @ssl.key_password)