diff --git a/examples/platforms/posix/platform-config.h b/examples/platforms/posix/platform-config.h
new file mode 100644
index 000000000..080d0860f
--- /dev/null
+++ b/examples/platforms/posix/platform-config.h
@@ -0,0 +1,43 @@
+/*
+ *  Copyright (c) 2018, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file
+ *   This file includes the platform-specific configuration.
+ *
+ */
+
+/**
+ * @def OPENTHREAD_POSIX_UART_BAUDRATE
+ *
+ * This setting configures the baudrate of the UART.
+ *
+ */
+#ifndef OPENTHREAD_POSIX_UART_BAUDRATE
+#define OPENTHREAD_POSIX_UART_BAUDRATE B115200
+#endif
diff --git a/examples/platforms/posix/platform-posix.h b/examples/platforms/posix/platform-posix.h
index fa16bedf3..d2caa0918 100644
--- a/examples/platforms/posix/platform-posix.h
+++ b/examples/platforms/posix/platform-posix.h
@@ -82,6 +82,7 @@ __forceinline void timersub(struct timeval *a, struct timeval *b, struct timeval
 #include <openthread/instance.h>
 
 #include "openthread-core-config.h"
+#include "platform-config.h"
 
 enum
 {
diff --git a/examples/platforms/posix/uart-posix.c b/examples/platforms/posix/uart-posix.c
index 18681a1fc..f2d3c8079 100644
--- a/examples/platforms/posix/uart-posix.c
+++ b/examples/platforms/posix/uart-posix.c
@@ -128,7 +128,8 @@ otError otPlatUartEnable(void)
         termios.c_cc[VTIME] = 0;
 
         // configure baud rate
-        otEXPECT_ACTION(cfsetispeed(&termios, B115200) == 0, perror("cfsetispeed"); error = OT_ERROR_GENERIC);
+        otEXPECT_ACTION(cfsetispeed(&termios, OPENTHREAD_POSIX_UART_BAUDRATE) == 0, perror("cfsetispeed");
+                        error = OT_ERROR_GENERIC);
 
         // set configuration
         otEXPECT_ACTION(tcsetattr(s_in_fd, TCSANOW, &termios) == 0, perror("tcsetattr"); error = OT_ERROR_GENERIC);
@@ -150,7 +151,8 @@ otError otPlatUartEnable(void)
         termios.c_cflag |= HUPCL | CREAD | CLOCAL;
 
         // configure baud rate
-        otEXPECT_ACTION(cfsetospeed(&termios, B115200) == 0, perror("cfsetospeed"); error = OT_ERROR_GENERIC);
+        otEXPECT_ACTION(cfsetospeed(&termios, OPENTHREAD_POSIX_UART_BAUDRATE) == 0, perror("cfsetospeed");
+                        error = OT_ERROR_GENERIC);
 
         // set configuration
         otEXPECT_ACTION(tcsetattr(s_out_fd, TCSANOW, &termios) == 0, perror("tcsetattr"); error = OT_ERROR_GENERIC);