diff --git a/boards/known/stm32f4discovery.lua b/boards/known/stm32f4discovery.lua
index ee341593..852513ce 100644
--- a/boards/known/stm32f4discovery.lua
+++ b/boards/known/stm32f4discovery.lua
@@ -5,7 +5,7 @@ return {
   components = {
     sercon = { uart = "cdc", speed = 115200 },
     romfs = true,
-    cdc = { buf_size = 64 },
+    cdc = { buf_size = 128 },
     advanced_shell = true,
     term = { lines = 25, cols = 80 },
     linenoise = { shell_lines = 10, lua_lines = 50 },