diff --git a/ports/rp2/machine_bitstream.c b/ports/rp2/machine_bitstream.c
index 4ef97f0c8..8411179f1 100644
--- a/ports/rp2/machine_bitstream.c
+++ b/ports/rp2/machine_bitstream.c
@@ -32,7 +32,11 @@
 
 #if MICROPY_PY_MACHINE_BITSTREAM
 
+#if PICO_RP2350
+#define MP_HAL_BITSTREAM_NS_OVERHEAD  (5)
+#else
 #define MP_HAL_BITSTREAM_NS_OVERHEAD  (9)
+#endif
 
 #if PICO_RISCV