diff --git a/doc/configuration.txt b/doc/configuration.txt
index 09705acb0..213febb76 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -927,6 +927,11 @@ file, or could be inherited by a program (See 3.7. Programs):
   defined in section 8.2.3 "HTTP log format". It can be used to override the
   default log format without having to copy the whole original definition.
 
+* HAPROXY_HTTP_CLF_LOG_FMT: contains the value of the default HTTP CLF log
+  format as defined in section 8.2.3 "HTTP log format". It can be used to
+  override the default log format without having to copy the whole original
+  definition.
+
   Example:
     # Add the rule that gave the final verdict to the log
     log-format "${HAPROXY_TCP_LOG_FMT} lr=last_rule_file:last_rule_line"
@@ -937,6 +942,9 @@ file, or could be inherited by a program (See 3.7. Programs):
 * HAPROXY_TCP_LOG_FMT: similar to HAPROXY_HTTP_LOG_FMT but for TCP log format
   as defined in section 8.2.2 "TCP log format".
 
+* HAPROXY_TCP_CLF_LOG_FMT: similar to HAPROXY_HTTP_CLF_LOG_FMT but for TCP CLF
+  log format as defined in section 8.2.2 "TCP log format".
+
 * HAPROXY_MWORKER: In master-worker mode, this variable is set to 1.
 
 * HAPROXY_CLI: configured listeners addresses of the stats socket for every
diff --git a/src/haproxy.c b/src/haproxy.c
index daae45335..8946c657b 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -1189,8 +1189,10 @@ static int read_cfg(char *progname)
 	 * unset them after the list_for_each_entry loop.
 	 */
 	setenv("HAPROXY_HTTP_LOG_FMT", default_http_log_format, 1);
+	setenv("HAPROXY_HTTP_CLF_LOG_FMT", clf_http_log_format, 1);
 	setenv("HAPROXY_HTTPS_LOG_FMT", default_https_log_format, 1);
 	setenv("HAPROXY_TCP_LOG_FMT", default_tcp_log_format, 1);
+	setenv("HAPROXY_TCP_CLF_LOG_FMT", clf_tcp_log_format, 1);
 	setenv("HAPROXY_BRANCH", PRODUCT_BRANCH, 1);
 	list_for_each_entry_safe(cfg, cfg_tmp, &cfg_cfgfiles, list) {
 		int ret;
@@ -1220,8 +1222,10 @@ static int read_cfg(char *progname)
 	/* remove temporary environment variables. */
 	unsetenv("HAPROXY_BRANCH");
 	unsetenv("HAPROXY_HTTP_LOG_FMT");
+	unsetenv("HAPROXY_HTTP_CLF_LOG_FMT");
 	unsetenv("HAPROXY_HTTPS_LOG_FMT");
 	unsetenv("HAPROXY_TCP_LOG_FMT");
+	unsetenv("HAPROXY_TCP_CLF_LOG_FMT");
 
 	/* do not try to resolve arguments nor to spot inconsistencies when
 	 * the configuration contains fatal errors.