diff --git a/ext/lexbor/config.m4 b/ext/lexbor/config.m4
index 43123578a727..a5261d630f88 100644
--- a/ext/lexbor/config.m4
+++ b/ext/lexbor/config.m4
@@ -1,4 +1,16 @@
 PHP_LEXBOR_CFLAGS="-Wno-unknown-warning-option -Wno-unterminated-string-initialization -I@ext_srcdir@/"
+
+if test "$PHP_ADDRESS_SANITIZER" = "yes"; then
+  PHP_LEXBOR_CFLAGS="$PHP_LEXBOR_CFLAGS -DLEXBOR_HAVE_ADDRESS_SANITIZER=1"
+else
+  case "$CFLAGS" in
+    *-fsanitize=address*|\
+    *-fsanitize=*,address*)
+      PHP_LEXBOR_CFLAGS="$PHP_LEXBOR_CFLAGS -DLEXBOR_HAVE_ADDRESS_SANITIZER=1"
+      ;;
+  esac
+fi
+
 LEXBOR_DIR="lexbor"
 
 AC_DEFINE([HAVE_LEXBOR], [1], [Define to 1 if the PHP extension 'lexbor' is available.])
diff --git a/ext/lexbor/config.w32 b/ext/lexbor/config.w32
index 403c3b98afb5..2b81bc60397f 100644
--- a/ext/lexbor/config.w32
+++ b/ext/lexbor/config.w32
@@ -25,6 +25,10 @@ ADD_SOURCES("ext/lexbor/lexbor/unicode", "idna.c unicode.c","lexbor");
 ADD_SOURCES("ext/lexbor/lexbor/url", "url.c","lexbor");
 ADD_FLAG("CFLAGS_LEXBOR", "/D LEXBOR_BUILDING /utf-8");
 
+if (PHP_SANITIZER == "yes") {
+    ADD_FLAG("CFLAGS_LEXBOR", "/D LEXBOR_HAVE_ADDRESS_SANITIZER=1");
+}
+
 AC_DEFINE("HAVE_LEXBOR", 1, "Define to 1 if the PHP extension 'lexbor' is available.");
 
 PHP_INSTALL_HEADERS("ext/lexbor", "php_lexbor.h lexbor/");
diff --git a/ext/lexbor/lexbor/url/url.c b/ext/lexbor/lexbor/url/url.c
index 8099c12089bb..abd376986f4a 100644
--- a/ext/lexbor/lexbor/url/url.c
+++ b/ext/lexbor/lexbor/url/url.c
@@ -3443,9 +3443,6 @@ lxb_url_host_parse(lxb_url_parser_t *parser, const lxb_char_t *data,
 
     if (lxb_url_is_ipv4(parser, domain->data, end)) {
         status = lxb_url_ipv4_parse(parser, domain->data, end, &ipv4);
-
-        (void) lexbor_str_destroy(domain, mraw, false);
-
         if (status != LXB_STATUS_OK) {
             return status;
         }