diff --git a/src/libboard_artiq/src/si5324.rs b/src/libboard_artiq/src/si5324.rs
index 574fec0b..cd318740 100644
--- a/src/libboard_artiq/src/si5324.rs
+++ b/src/libboard_artiq/src/si5324.rs
@@ -29,7 +29,7 @@ pub struct FrequencySettings {
     pub n31: u32,
     pub n32: u32,
     pub bwsel: u8,
-    pub crystal_ref: bool
+    pub crystal_as_ckin2: bool
 }
 
 pub enum Input {
@@ -84,7 +84,7 @@ fn map_frequency_settings(settings: &FrequencySettings) -> Result<FrequencySetti
         n31: settings.n31 - 1,
         n32: settings.n32 - 1,
         bwsel: settings.bwsel,
-        crystal_ref: settings.crystal_ref
+        crystal_as_ckin2: settings.crystal_as_ckin2
     };
     Ok(r)
 }
@@ -227,7 +227,7 @@ pub fn setup(i2c: &mut I2c, settings: &FrequencySettings, input: Input, timer: &
     };
 
     init(i2c, timer)?;
-    if settings.crystal_ref {
+    if settings.crystal_as_ckin2 {
         rmw(i2c, 0,   |v| v | 0x40)?;                     // FREE_RUN=1
     }
     rmw(i2c, 2,   |v| (v & 0x0f) | (s.bwsel << 4))?;
diff --git a/src/runtime/src/rtio_clocking.rs b/src/runtime/src/rtio_clocking.rs
index 8b887575..de0f4724 100644
--- a/src/runtime/src/rtio_clocking.rs
+++ b/src/runtime/src/rtio_clocking.rs
@@ -133,7 +133,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 6,
                     n32    : 6,
                     bwsel  : 4,
-                    crystal_ref: false
+                    crystal_as_ckin2: false
                 },
                 SI5324_EXT_INPUT
             )
@@ -149,7 +149,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 52,
                     n32    : 52,
                     bwsel  : 4,
-                    crystal_ref: false
+                    crystal_as_ckin2: false
                 },
                 SI5324_EXT_INPUT
             )
@@ -165,7 +165,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 63,
                     n32    : 63,
                     bwsel  : 4,
-                    crystal_ref: false
+                    crystal_as_ckin2: false
                 },
                 SI5324_EXT_INPUT
             )
@@ -181,7 +181,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 7139,
                     n32    : 7139,
                     bwsel  : 3,
-                    crystal_ref: true
+                    crystal_as_ckin2: true
                 },
                 si5324::Input::Ckin2
             )
@@ -197,7 +197,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 7139,
                     n32    : 7139,
                     bwsel  : 3,
-                    crystal_ref: true
+                    crystal_as_ckin2: true
                 },
                 si5324::Input::Ckin2
             )
@@ -213,7 +213,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 4565,
                     n32    : 4565,
                     bwsel  : 4,
-                    crystal_ref: true
+                    crystal_as_ckin2: true
                 },
                 si5324::Input::Ckin2
             )
@@ -229,7 +229,7 @@ fn setup_si5324(i2c: &mut I2c, timer: &mut GlobalTimer, clk: RtioClock) {
                     n31    : 4565,
                     n32    : 4565,
                     bwsel  : 4,
-                    crystal_ref: true
+                    crystal_as_ckin2: true
                 },
                 si5324::Input::Ckin2
             )
diff --git a/src/satman/src/main.rs b/src/satman/src/main.rs
index 9544f011..76a2f589 100644
--- a/src/satman/src/main.rs
+++ b/src/satman/src/main.rs
@@ -428,7 +428,7 @@ const SI5324_SETTINGS: si5324::FrequencySettings
     n31    : 63,
     n32    : 63,
     bwsel  : 4,
-    crystal_ref: true
+    crystal_as_ckin2: true
 };
 
 #[cfg(all(has_si5324, rtio_frequency = "100.0"))]
@@ -441,7 +441,7 @@ const SI5324_SETTINGS: si5324::FrequencySettings
     n31    : 50,
     n32    : 50,
     bwsel  : 4,
-    crystal_ref: true
+    crystal_as_ckin2: true
 };
 
 static mut LOG_BUFFER: [u8; 1<<17] = [0; 1<<17];