diff --git a/lib/nghttp2_hd.c b/lib/nghttp2_hd.c
index 95176b3b..d283a425 100644
--- a/lib/nghttp2_hd.c
+++ b/lib/nghttp2_hd.c
@@ -281,11 +281,9 @@ static void hd_ringbuf_pop_back(nghttp2_hd_ringbuf *ringbuf)
   --ringbuf->len;
 }
 
-static int hd_context_init(nghttp2_hd_context *context,
-                           nghttp2_hd_role role)
+static int hd_context_init(nghttp2_hd_context *context)
 {
   int rv;
-  context->role = role;
   context->bad = 0;
   context->hd_table_bufsize_max = NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
   rv = hd_ringbuf_init
@@ -314,7 +312,7 @@ int nghttp2_hd_deflate_init2(nghttp2_hd_deflater *deflater,
                              size_t deflate_hd_table_bufsize_max)
 {
   int rv;
-  rv =  hd_context_init(&deflater->ctx, NGHTTP2_HD_ROLE_DEFLATE);
+  rv =  hd_context_init(&deflater->ctx);
   if(rv != 0) {
     return rv;
   }
@@ -335,7 +333,7 @@ int nghttp2_hd_inflate_init(nghttp2_hd_inflater *inflater)
 {
   int rv;
 
-  rv = hd_context_init(&inflater->ctx, NGHTTP2_HD_ROLE_INFLATE);
+  rv = hd_context_init(&inflater->ctx);
   if(rv != 0) {
     goto fail;
   }
diff --git a/lib/nghttp2_hd.h b/lib/nghttp2_hd.h
index 2c16af05..aedaf922 100644
--- a/lib/nghttp2_hd.h
+++ b/lib/nghttp2_hd.h
@@ -50,11 +50,6 @@
 /* Exported for unit test */
 extern const size_t NGHTTP2_STATIC_TABLE_LENGTH;
 
-typedef enum {
-  NGHTTP2_HD_ROLE_DEFLATE,
-  NGHTTP2_HD_ROLE_INFLATE
-} nghttp2_hd_role;
-
 typedef enum {
   NGHTTP2_HD_FLAG_NONE = 0,
   /* Indicates name was dynamically allocated and must be freed */
@@ -115,8 +110,6 @@ typedef struct {
   size_t hd_table_bufsize;
   /* The effective header table size. */
   size_t hd_table_bufsize_max;
-  /* Role of this context; deflate or infalte */
-  nghttp2_hd_role role;
   /* If inflate/deflate error occurred, this value is set to 1 and
      further invocation of inflate/deflate will fail with
      NGHTTP2_ERR_HEADER_COMP. */