diff --git a/src/Kconfig b/src/Kconfig
index 320b4f1bc9..bcac38c78a 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -456,6 +456,7 @@ config RT_USING_CONSOLE
 if RT_USING_CONSOLE
     config RT_CONSOLEBUF_SIZE
         int "the buffer size for console log printf"
+        default 256 if RT_USING_UTEST
         default 128
 
     config RT_CONSOLE_DEVICE_NAME