diff --git a/examples/SpdyServer.cc b/examples/SpdyServer.cc
index 3ce11bd7..945dd2ec 100644
--- a/examples/SpdyServer.cc
+++ b/examples/SpdyServer.cc
@@ -243,6 +243,7 @@ bool SpdyEventHandler::finish()
 ssize_t SpdyEventHandler::send_data(const uint8_t *data, size_t len, int flags)
 {
   ssize_t r;
+  ERR_clear_error();
   r = SSL_write(ssl_, data, len);
   return r;
 }
@@ -251,6 +252,7 @@ ssize_t SpdyEventHandler::recv_data(uint8_t *data, size_t len, int flags)
 {
   ssize_t r;
   want_write_ = false;
+  ERR_clear_error();
   r = SSL_read(ssl_, data, len);
   if(r < 0) {
     if(SSL_get_error(ssl_, r) == SSL_ERROR_WANT_WRITE) {
@@ -663,6 +665,7 @@ public:
   virtual int execute(Sessions *sessions)
   {
     want_read_ = want_write_ = false;
+    ERR_clear_error();
     int r = SSL_accept(ssl_);
     if(r == 1) {
       finish_ = true;
diff --git a/examples/spdycli.c b/examples/spdycli.c
index b70b6a82..f24dc098 100644
--- a/examples/spdycli.c
+++ b/examples/spdycli.c
@@ -170,6 +170,7 @@ static ssize_t send_callback(spdylay_session *session,
   ssize_t rv;
   connection = (struct Connection*)user_data;
   connection->want_io = IO_NONE;
+  ERR_clear_error();
   rv = SSL_write(connection->ssl, data, length);
   if(rv < 0) {
     int err = SSL_get_error(connection->ssl, rv);
@@ -198,6 +199,7 @@ static ssize_t recv_callback(spdylay_session *session,
   ssize_t rv;
   connection = (struct Connection*)user_data;
   connection->want_io = IO_NONE;
+  ERR_clear_error();
   rv = SSL_read(connection->ssl, buf, length);
   if(rv < 0) {
     int err = SSL_get_error(connection->ssl, rv);
@@ -418,6 +420,7 @@ static void ssl_handshake(SSL *ssl, int fd)
   if(SSL_set_fd(ssl, fd) == 0) {
     dief("SSL_set_fd", ERR_error_string(ERR_get_error(), NULL));
   }
+  ERR_clear_error();
   rv = SSL_connect(ssl);
   if(rv <= 0) {
     dief("SSL_connect", ERR_error_string(ERR_get_error(), NULL));
diff --git a/examples/spdylay_ssl.cc b/examples/spdylay_ssl.cc
index 105e778c..33c045a5 100644
--- a/examples/spdylay_ssl.cc
+++ b/examples/spdylay_ssl.cc
@@ -74,6 +74,7 @@ int Spdylay::send()
 ssize_t Spdylay::send_data(const uint8_t *data, size_t len, int flags)
 {
   ssize_t r;
+  ERR_clear_error();
   r = SSL_write(ssl_, data, len);
   return r;
 }
@@ -82,6 +83,7 @@ ssize_t Spdylay::recv_data(uint8_t *data, size_t len, int flags)
 {
   ssize_t r;
   want_write_ = false;
+  ERR_clear_error();
   r = SSL_read(ssl_, data, len);
   if(r < 0) {
     if(SSL_get_error(ssl_, r) == SSL_ERROR_WANT_WRITE) {
@@ -502,6 +504,7 @@ int ssl_handshake(SSL *ssl, int fd)
     std::cerr << ERR_error_string(ERR_get_error(), 0) << std::endl;
     return -1;
   }
+  ERR_clear_error();
   int r = SSL_connect(ssl);
   if(r <= 0) {
     std::cerr << ERR_error_string(ERR_get_error(), 0) << std::endl;