diff --git a/libmariadb/mariadb_lib.c b/libmariadb/mariadb_lib.c
index a4e7466b..7a38a875 100644
--- a/libmariadb/mariadb_lib.c
+++ b/libmariadb/mariadb_lib.c
@@ -39,6 +39,10 @@
 #include <time.h>
 #include <mariadb_dyncol.h>
 
+#ifndef __has_feature
+# define __has_feature(x) 0
+#endif
+
 #ifdef HAVE_PWD_H
 #include <pwd.h>
 #endif
@@ -3720,12 +3724,16 @@ static void mysql_once_init()
   }
   if (!mysql_port)
   {
+#if !__has_feature(memory_sanitizer) /* work around MSAN deficiency */
     struct servent *serv_ptr;
+#endif
     char *env;
 
     mysql_port = MARIADB_PORT;
+#if !__has_feature(memory_sanitizer) /* work around MSAN deficiency */
     if ((serv_ptr = getservbyname("mysql", "tcp")))
       mysql_port = (uint)ntohs((ushort)serv_ptr->s_port);
+#endif
     if ((env = getenv("MYSQL_TCP_PORT")))
       mysql_port =(uint)atoi(env);
   }