diff --git a/src/libboard_artiq/src/si549.rs b/src/libboard_artiq/src/si549.rs
index 8fa53b3..11733f2 100644
--- a/src/libboard_artiq/src/si549.rs
+++ b/src/libboard_artiq/src/si549.rs
@@ -450,9 +450,8 @@ pub mod wrpll {
 
     fn get_freq_counts(timer: &mut GlobalTimer) -> (u32, u32) {
         unsafe {
-            csr::wrpll::frequency_counter_update_en_write(1);
+            csr::wrpll::frequency_counter_update_write(1);
             timer.delay_us(150_000); // 8ns << TIMER_WIDTH
-            csr::wrpll::frequency_counter_update_en_write(0);
             #[cfg(wrpll_ref_clk = "GT_CDR")]
             let ref_count = csr::wrpll::frequency_counter_counter_rtio_rx0_read();
             #[cfg(wrpll_ref_clk = "SMA_CLKIN")]