diff --git a/config/schism/env.ini b/config/schism/env.ini
index 7fa0a0aa..40c42504 100644
--- a/config/schism/env.ini
+++ b/config/schism/env.ini
@@ -1,5 +1,6 @@
 [env:schism]
 extends = arduino_pico_base
+board_build.f_cpu = 130000000L
 build_src_filter =
     ${arduino_pico_base.build_src_filter}
     +<config/schism>