diff --git a/doc/nghttpx.h2r b/doc/nghttpx.h2r
index 46138042..107a0108 100644
--- a/doc/nghttpx.h2r
+++ b/doc/nghttpx.h2r
@@ -368,10 +368,14 @@ respectively.
 
         Return the TLS SNI value which client sent in this connection.
 
-    .. rb:attr_reader:: tls_client_fingerprint
+    .. rb:attr_reader:: tls_client_fingerprint_sha256
 
         Return the SHA-256 fingerprint of a client certificate.
 
+    .. rb:attr_reader:: tls_client_fingerprint_sha1
+
+        Return the SHA-1 fingerprint of a client certificate.
+
     .. rb:attr_reader:: tls_client_subject_name
 
         Return the subject name of a client certificate.
diff --git a/gennghttpxfun.py b/gennghttpxfun.py
index fffa3f8e..054444aa 100755
--- a/gennghttpxfun.py
+++ b/gennghttpxfun.py
@@ -191,7 +191,8 @@ LOGVARS = [
     "tls_session_id",
     "tls_session_reused",
     "tls_sni",
-    "tls_client_fingerprint",
+    "tls_client_fingerprint_sha256",
+    "tls_client_fingerprint_sha1",
     "tls_client_subject_name",
     "backend_host",
     "backend_port",
diff --git a/src/shrpx.cc b/src/shrpx.cc
index 2656b717..b53ca7ee 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -2482,8 +2482,10 @@ Logging:
                 the response.   For HTTP/1,  ALPN is  always http/1.1,
                 regardless of minor version.
               * $tls_cipher: cipher used for SSL/TLS connection.
-              * $tls_client_fingerprint: SHA-256 fingerprint of client
-                certificate.
+              * $tls_client_fingerprint_sha256: SHA-256 fingerprint of
+                client certificate.
+              * $tls_client_fingerprint_sha1:  SHA-1   fingerprint  of
+                client certificate.
               * $tls_client_subject_name:   subject  name   in  client
                 certificate.
               * $tls_protocol: protocol for SSL/TLS connection.
diff --git a/src/shrpx_config.cc b/src/shrpx_config.cc
index 6969c4de..1efe0c04 100644
--- a/src/shrpx_config.cc
+++ b/src/shrpx_config.cc
@@ -510,15 +510,6 @@ LogFragmentType log_var_lookup_token(const char *name, size_t namelen) {
       break;
     }
     break;
-  case 22:
-    switch (name[21]) {
-    case 't':
-      if (util::strieq_l("tls_client_fingerprin", name, 21)) {
-        return SHRPX_LOGF_TLS_CLIENT_FINGERPRINT;
-      }
-      break;
-    }
-    break;
   case 23:
     switch (name[22]) {
     case 'e':
@@ -528,6 +519,24 @@ LogFragmentType log_var_lookup_token(const char *name, size_t namelen) {
       break;
     }
     break;
+  case 27:
+    switch (name[26]) {
+    case '1':
+      if (util::strieq_l("tls_client_fingerprint_sha", name, 26)) {
+        return SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA1;
+      }
+      break;
+    }
+    break;
+  case 29:
+    switch (name[28]) {
+    case '6':
+      if (util::strieq_l("tls_client_fingerprint_sha25", name, 28)) {
+        return SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA256;
+      }
+      break;
+    }
+    break;
   }
   return SHRPX_LOGF_NONE;
 }
diff --git a/src/shrpx_log.cc b/src/shrpx_log.cc
index c803378c..84624eaa 100644
--- a/src/shrpx_log.cc
+++ b/src/shrpx_log.cc
@@ -533,7 +533,8 @@ void upstream_accesslog(const std::vector<LogFragment> &lfv,
       }
       std::tie(p, last) = copy_escape(lgsp.sni, p, last);
       break;
-    case SHRPX_LOGF_TLS_CLIENT_FINGERPRINT: {
+    case SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA1:
+    case SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA256: {
       if (!lgsp.ssl) {
         std::tie(p, last) = copy('-', p, last);
         break;
@@ -544,7 +545,10 @@ void upstream_accesslog(const std::vector<LogFragment> &lfv,
         break;
       }
       std::array<uint8_t, 32> buf;
-      auto len = tls::get_x509_fingerprint(buf.data(), buf.size(), x);
+      auto len = tls::get_x509_fingerprint(
+          buf.data(), buf.size(), x,
+          lf.type == SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA256 ? EVP_sha256()
+                                                              : EVP_sha1());
       X509_free(x);
       if (len <= 0) {
         std::tie(p, last) = copy('-', p, last);
diff --git a/src/shrpx_log.h b/src/shrpx_log.h
index a413ce85..9584e6ae 100644
--- a/src/shrpx_log.h
+++ b/src/shrpx_log.h
@@ -138,7 +138,8 @@ enum LogFragmentType {
   SHRPX_LOGF_TLS_SESSION_REUSED,
   SHRPX_LOGF_SSL_SESSION_REUSED = SHRPX_LOGF_TLS_SESSION_REUSED,
   SHRPX_LOGF_TLS_SNI,
-  SHRPX_LOGF_TLS_CLIENT_FINGERPRINT,
+  SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA1,
+  SHRPX_LOGF_TLS_CLIENT_FINGERPRINT_SHA256,
   SHRPX_LOGF_TLS_CLIENT_SUBJECT_NAME,
   SHRPX_LOGF_BACKEND_HOST,
   SHRPX_LOGF_BACKEND_PORT,
diff --git a/src/shrpx_mruby_module_env.cc b/src/shrpx_mruby_module_env.cc
index 5a7b9469..9805e078 100644
--- a/src/shrpx_mruby_module_env.cc
+++ b/src/shrpx_mruby_module_env.cc
@@ -142,7 +142,7 @@ mrb_value env_get_tls_sni(mrb_state *mrb, mrb_value self) {
 } // namespace
 
 namespace {
-mrb_value env_get_tls_client_fingerprint(mrb_state *mrb, mrb_value self) {
+mrb_value env_get_tls_client_fingerprint_md(mrb_state *mrb, const EVP_MD *md) {
   auto data = static_cast<MRubyAssocData *>(mrb->ud);
   auto downstream = data->downstream;
   auto upstream = downstream->get_upstream();
@@ -158,9 +158,9 @@ mrb_value env_get_tls_client_fingerprint(mrb_state *mrb, mrb_value self) {
     return mrb_str_new_static(mrb, "", 0);
   }
 
-  // Fingerprint is SHA-256, so we need 32 bytes buffer.
+  // Currently the largest hash value is SHA-256, which is 32 bytes.
   std::array<uint8_t, 32> buf;
-  auto slen = tls::get_x509_fingerprint(buf.data(), buf.size(), x);
+  auto slen = tls::get_x509_fingerprint(buf.data(), buf.size(), x, md);
   X509_free(x);
   if (slen == -1) {
     mrb_raise(mrb, E_RUNTIME_ERROR, "could not compute client fingerprint");
@@ -174,6 +174,19 @@ mrb_value env_get_tls_client_fingerprint(mrb_state *mrb, mrb_value self) {
 }
 } // namespace
 
+namespace {
+mrb_value env_get_tls_client_fingerprint_sha256(mrb_state *mrb,
+                                                mrb_value self) {
+  return env_get_tls_client_fingerprint_md(mrb, EVP_sha256());
+}
+} // namespace
+
+namespace {
+mrb_value env_get_tls_client_fingerprint_sha1(mrb_state *mrb, mrb_value self) {
+  return env_get_tls_client_fingerprint_md(mrb, EVP_sha1());
+}
+} // namespace
+
 namespace {
 mrb_value env_get_tls_client_subject_name(mrb_state *mrb, mrb_value self) {
   auto data = static_cast<MRubyAssocData *>(mrb->ud);
@@ -303,8 +316,10 @@ void init_env_class(mrb_state *mrb, RClass *module) {
                     MRB_ARGS_NONE());
   mrb_define_method(mrb, env_class, "tls_sni", env_get_tls_sni,
                     MRB_ARGS_NONE());
-  mrb_define_method(mrb, env_class, "tls_client_fingerprint",
-                    env_get_tls_client_fingerprint, MRB_ARGS_NONE());
+  mrb_define_method(mrb, env_class, "tls_client_fingerprint_sha256",
+                    env_get_tls_client_fingerprint_sha256, MRB_ARGS_NONE());
+  mrb_define_method(mrb, env_class, "tls_client_fingerprint_sha1",
+                    env_get_tls_client_fingerprint_sha1, MRB_ARGS_NONE());
   mrb_define_method(mrb, env_class, "tls_client_subject_name",
                     env_get_tls_client_subject_name, MRB_ARGS_NONE());
   mrb_define_method(mrb, env_class, "tls_cipher", env_get_tls_cipher,
diff --git a/src/shrpx_tls.cc b/src/shrpx_tls.cc
index 806ae103..8126b5ce 100644
--- a/src/shrpx_tls.cc
+++ b/src/shrpx_tls.cc
@@ -1920,10 +1920,10 @@ int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp,
   return 0;
 }
 
-ssize_t get_x509_fingerprint(uint8_t *dst, size_t dstlen, X509 *x) {
-  assert(dstlen >= 32);
+ssize_t get_x509_fingerprint(uint8_t *dst, size_t dstlen, const X509 *x,
+                             const EVP_MD *md) {
   unsigned int len = dstlen;
-  if (X509_digest(x, EVP_sha256(), dst, &len) != 1) {
+  if (X509_digest(x, md, dst, &len) != 1) {
     return -1;
   }
   return len;
diff --git a/src/shrpx_tls.h b/src/shrpx_tls.h
index 6fd8d2b6..87ed7f3e 100644
--- a/src/shrpx_tls.h
+++ b/src/shrpx_tls.h
@@ -269,10 +269,12 @@ int proto_version_from_string(const StringRef &v);
 int verify_ocsp_response(SSL_CTX *ssl_ctx, const uint8_t *ocsp_resp,
                          size_t ocsp_resplen);
 
-// Stores SHA-256 fingerprint of |x| in |dst| of length |dstlen|.
-// |dstlen| must be larger than 32 bytes.  This function returns the
-// number of bytes written in |dst|, or -1.
-ssize_t get_x509_fingerprint(uint8_t *dst, size_t dstlen, X509 *x);
+// Stores fingerprint of |x| in |dst| of length |dstlen|.  |md|
+// specifies hash function to use, and |dstlen| must be large enough
+// to include hash value (e.g., 32 bytes for SHA-256).  This function
+// returns the number of bytes written in |dst|, or -1.
+ssize_t get_x509_fingerprint(uint8_t *dst, size_t dstlen, const X509 *x,
+                             const EVP_MD *md);
 
 // Returns subject name of |x|.  If this function fails to get subject
 // name, it returns an empty string.