diff --git a/drivers/syslog/syslog_channel.c b/drivers/syslog/syslog_channel.c
index 04a3a80057..44a81a5d81 100644
--- a/drivers/syslog/syslog_channel.c
+++ b/drivers/syslog/syslog_channel.c
@@ -31,6 +31,7 @@
 
 #include <nuttx/syslog/syslog.h>
 #include <nuttx/compiler.h>
+#include <nuttx/mutex.h>
 
 #ifdef CONFIG_RAMLOG_SYSLOG
 #  include <nuttx/syslog/ramlog.h>
@@ -217,7 +218,13 @@ static ssize_t syslog_default_write(FAR struct syslog_channel_s *channel,
                                     FAR const char *buffer, size_t buflen)
 {
 #if defined(CONFIG_ARCH_LOWPUTC)
+  static mutex_t lock = NXMUTEX_INITIALIZER;
+
+  nxmutex_lock(&lock);
+
   up_nputs(buffer, buflen);
+
+  nxmutex_unlock(&lock);
 #endif
 
   UNUSED(channel);