diff --git a/integration-tests/nghttpx_http2_test.go b/integration-tests/nghttpx_http2_test.go
index bc6f30a4..f7825733 100644
--- a/integration-tests/nghttpx_http2_test.go
+++ b/integration-tests/nghttpx_http2_test.go
@@ -317,16 +317,16 @@ func TestH2H1AssembleCookies(t *testing.T) {
 	}
 }
 
-// TestH2H1TETrailer tests that server accepts TE request header field
-// if it has trailer only.
-func TestH2H1TETrailer(t *testing.T) {
+// TestH2H1TETrailers tests that server accepts TE request header
+// field if it has trailers only.
+func TestH2H1TETrailers(t *testing.T) {
 	st := newServerTester(nil, t, noopHandler)
 	defer st.Close()
 
 	res, err := st.http2(requestParam{
-		name: "TestH2H1TETrailer",
+		name: "TestH2H1TETrailers",
 		header: []hpack.HeaderField{
-			pair("te", "trailer"),
+			pair("te", "trailers"),
 		},
 	})
 	if err != nil {
@@ -337,8 +337,8 @@ func TestH2H1TETrailer(t *testing.T) {
 	}
 }
 
-// TestH2H1TEGzip tests that server reset stream if TE request
-// header field contains gzip.
+// TestH2H1TEGzip tests that server resets stream if TE request header
+// field contains gzip.
 func TestH2H1TEGzip(t *testing.T) {
 	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
 		t.Error("server should not forward bad request")
diff --git a/src/http2.cc b/src/http2.cc
index 0765e8a7..9ddf9bfb 100644
--- a/src/http2.cc
+++ b/src/http2.cc
@@ -664,38 +664,6 @@ const Headers::value_type *get_header(const int *hdidx, int token,
   return &nva[i];
 }
 
-bool check_http2_te(const uint8_t *value, size_t valuelen) {
-  auto first = value;
-  auto last = first + valuelen;
-  for (;;) {
-    if (first == last) {
-      return true;
-    }
-    auto end_param = std::find(first, last, ',');
-    auto len = end_param - first;
-    if (!util::istartsWith(reinterpret_cast<const char *>(first), len,
-                           "trailer")) {
-      return false;
-    }
-    if (len == sizeof("trailer") - 1) {
-      goto next;
-    }
-    switch (first[sizeof("trailer") - 1]) {
-    case ' ':
-    case ';':
-      goto next;
-    }
-    return false;
-  next:
-    if (end_param == last) {
-      return true;
-    }
-    first = std::find_if_not(end_param + 1, last, [](uint8_t c) {
-      return c == ' ' || c == '\t' || c == ',';
-    });
-  }
-}
-
 } // namespace http2
 
 } // namespace nghttp2
diff --git a/src/http2.h b/src/http2.h
index a3e22d87..fed901ec 100644
--- a/src/http2.h
+++ b/src/http2.h
@@ -244,12 +244,6 @@ bool http2_mandatory_request_headers_presence(const int *hdidx);
 const Headers::value_type *get_header(const int *hdidx, int token,
                                       const Headers &nva);
 
-// Returns true if TE request header field value |value| of length
-// |valuelen| is empty or only contains "trailers".  The valid header
-// field value is "trailer" and optionally followed by "," or OWS for
-// simplicity.
-bool check_http2_te(const uint8_t *value, size_t valuelen);
-
 } // namespace http2
 
 } // namespace nghttp2
diff --git a/src/http2_test.cc b/src/http2_test.cc
index c63dc3ce..9edc1bd1 100644
--- a/src/http2_test.cc
+++ b/src/http2_test.cc
@@ -290,60 +290,4 @@ void test_http2_mandatory_request_headers_presence(void) {
   CU_ASSERT(http2::http2_mandatory_request_headers_presence(hdidx));
 }
 
-void test_http2_check_http2_te(void) {
-  {
-    const uint8_t v[] = "trailer";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "Trailer";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer,";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer,,";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer, ,";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer, , ";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer; q=0.9";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer ; q=0.9";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer ; q=0.9, trailer";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailer ; q=0.9,  trailer";
-    CU_ASSERT(http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  // failure cases
-  {
-    const uint8_t v[] = "trailer; q=0.9, gzip";
-    CU_ASSERT(!http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "traile";
-    CU_ASSERT(!http2::check_http2_te(v, sizeof(v) - 1));
-  }
-  {
-    const uint8_t v[] = "trailerr";
-    CU_ASSERT(!http2::check_http2_te(v, sizeof(v) - 1));
-  }
-}
-
 } // namespace shrpx
diff --git a/src/http2_test.h b/src/http2_test.h
index fba64e1e..f8127dc7 100644
--- a/src/http2_test.h
+++ b/src/http2_test.h
@@ -39,7 +39,6 @@ void test_http2_lookup_token(void);
 void test_http2_check_http2_pseudo_header(void);
 void test_http2_http2_header_allowed(void);
 void test_http2_mandatory_request_headers_presence(void);
-void test_http2_check_http2_te(void);
 
 } // namespace shrpx
 
diff --git a/src/shrpx-unittest.cc b/src/shrpx-unittest.cc
index f7218069..59c900f3 100644
--- a/src/shrpx-unittest.cc
+++ b/src/shrpx-unittest.cc
@@ -93,8 +93,6 @@ int main(int argc, char *argv[]) {
                    shrpx::test_http2_http2_header_allowed) ||
       !CU_add_test(pSuite, "http2_mandatory_request_headers_presence",
                    shrpx::test_http2_mandatory_request_headers_presence) ||
-      !CU_add_test(pSuite, "http2_check_http2_te",
-                   shrpx::test_http2_check_http2_te) ||
       !CU_add_test(pSuite, "downstream_index_request_headers",
                    shrpx::test_downstream_index_request_headers) ||
       !CU_add_test(pSuite, "downstream_index_response_headers",
diff --git a/src/shrpx_http2_upstream.cc b/src/shrpx_http2_upstream.cc
index 7bef7cb0..4261e910 100644
--- a/src/shrpx_http2_upstream.cc
+++ b/src/shrpx_http2_upstream.cc
@@ -226,7 +226,7 @@ int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
     break;
   }
   case http2::HD_TE:
-    if (!http2::check_http2_te(value, valuelen)) {
+    if (!util::strieq("trailers", value, valuelen)) {
       upstream->rst_stream(downstream, NGHTTP2_PROTOCOL_ERROR);
       return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
     }