diff --git a/src/runtime/src/rtio_clocking.rs b/src/runtime/src/rtio_clocking.rs
index db4c2e3..53f2192 100644
--- a/src/runtime/src/rtio_clocking.rs
+++ b/src/runtime/src/rtio_clocking.rs
@@ -1,14 +1,15 @@
 use log::{info, warn};
-use libboard_zynq::{timer::GlobalTimer};
+use libboard_zynq::timer::GlobalTimer;
 use embedded_hal::blocking::delay::DelayMs;
 use libconfig::Config;
 use libboard_artiq::pl;
+#[cfg(has_si5324)]
+use libboard_zynq::i2c::I2c;
+#[cfg(has_si5324)]
 use crate::i2c;
-
 #[cfg(has_si5324)]
 use libboard_artiq::si5324;
 
-
 #[derive(Debug, PartialEq, Copy, Clone)]
 #[allow(non_camel_case_types)]
 pub enum RtioClock {
@@ -90,7 +91,7 @@ fn init_drtio(timer: &mut GlobalTimer)
 }
 
 #[cfg(has_si5324)]
-fn setup_si5324(timer: &mut GlobalTimer, clk: RtioClock) {
+fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
     let mut si5324_settings: Option<si5324::FrequencySettings> = None;
     // 125MHz output, from crystal, 7 Hz
     if si5324_settings.is_none() || clk == RtioClock::Int_125 {
@@ -107,8 +108,7 @@ fn setup_si5324(timer: &mut GlobalTimer, clk: RtioClock) {
         });
     }
     let si5324_ref_input = si5324::Input::Ckin2;
-    si5324::setup(unsafe { (&mut i2c::I2C_BUS).as_mut().unwrap() },
-        &si5324_settings.unwrap(), si5324_ref_input, timer).expect("cannot initialize Si5324");
+    si5324::setup(i2c, &si5324_settings.unwrap(), si5324_ref_input, timer).expect("cannot initialize Si5324");
 }
 
 pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
@@ -116,10 +116,11 @@ pub fn init(timer: &mut GlobalTimer, cfg: &Config) {
     let clk = get_rtio_clock_cfg(cfg);
     #[cfg(has_si5324)]
     {
+        let i2c = unsafe { (&mut i2c::I2C_BUS).as_mut().unwrap() };
         let si5324_ext_input = si5324::Input::Ckin2;
         match clk {
-            RtioClock::Ext0_Bypass => si5324::bypass(si5324_ext_input).expect("cannot bypass Si5324"),
-            _ => setup_si5324(timer, clk),
+            RtioClock::Ext0_Bypass => si5324::bypass(i2c, si5324_ext_input, timer).expect("cannot bypass Si5324"),
+            _ => setup_si5324(i2c, timer, clk),
         }
     }
     #[cfg(has_drtio)]