diff --git a/bricks/movehub/Makefile b/bricks/movehub/Makefile
index 2974f30c3..6f7df12cf 100644
--- a/bricks/movehub/Makefile
+++ b/bricks/movehub/Makefile
@@ -11,4 +11,7 @@ PB_LIB_BLUENRG = 1
 PB_FROZEN_MODULES = 0
 MICROPY_ROM_TEXT_COMPRESSION = 0 # Needed for PYBRICKS_OPT_TERSE_ERR
 
+# Reduce code size at the cost of slower performance.
+override CSUPEROPT = -Os
+
 include ../_common/common.mk
diff --git a/bricks/technichub/Makefile b/bricks/technichub/Makefile
index 2df580be4..b87a8036e 100644
--- a/bricks/technichub/Makefile
+++ b/bricks/technichub/Makefile
@@ -11,4 +11,7 @@ PB_LIB_BLE5STACK = 1
 PB_LIB_LSM6DS3TR_C = 1
 PB_FROZEN_MODULES = 1
 
+# Reduce code size at the cost of slower performance.
+override CSUPEROPT = -Os
+
 include ../_common/common.mk