diff --git a/lib/spdylay_buffer.c b/lib/spdylay_buffer.c
index e321594..d41d697 100644
--- a/lib/spdylay_buffer.c
+++ b/lib/spdylay_buffer.c
@@ -106,7 +106,6 @@ int spdylay_buffer_write(spdylay_buffer *buffer, const uint8_t *data,
                           size_t len)
 {
   int rv;
-  size_t i;
   while(len) {
     size_t writelen;
     if(spdylay_buffer_avail(buffer) == 0) {
diff --git a/lib/spdylay_frame.c b/lib/spdylay_frame.c
index df18088..f7acaba 100644
--- a/lib/spdylay_frame.c
+++ b/lib/spdylay_frame.c
@@ -696,7 +696,6 @@ int spdylay_frame_unpack_syn_stream_without_nv(spdylay_syn_stream *frame,
                                                const uint8_t *payload,
                                                size_t payloadlen)
 {
-  int r;
   spdylay_frame_unpack_ctrl_hd(&frame->hd, head);
   if(headlen + payloadlen != SPDYLAY_SYN_STREAM_NV_OFFSET) {
     return SPDYLAY_ERR_INVALID_FRAME;
diff --git a/lib/spdylay_session.c b/lib/spdylay_session.c
index 783c162..e428af7 100644
--- a/lib/spdylay_session.c
+++ b/lib/spdylay_session.c
@@ -2456,7 +2456,6 @@ ssize_t spdylay_session_mem_recv(spdylay_session *session,
   while(1) {
     ssize_t r;
     if(session->iframe.state == SPDYLAY_RECV_HEAD) {
-      uint32_t payloadlen;
       size_t remheadbytes;
       size_t readlen;
       size_t bufavail = inlimit-inmark;