diff --git a/boards.txt b/boards.txt
index 9bb3f53b7bf..dcf6301a523 100644
--- a/boards.txt
+++ b/boards.txt
@@ -3895,7 +3895,7 @@ um_feathers3neo.build.cdc_on_boot=1
 um_feathers3neo.build.msc_on_boot=0
 um_feathers3neo.build.dfu_on_boot=0
 um_feathers3neo.build.f_cpu=240000000L
-um_feathers3neo.build.flash_size=16MB
+um_feathers3neo.build.flash_size=8MB
 um_feathers3neo.build.flash_freq=80m
 um_feathers3neo.build.flash_mode=dio
 um_feathers3neo.build.boot=qio