diff --git a/artiq/firmware/libboard/sdram.rs b/artiq/firmware/libboard/sdram.rs
index f924f2df1..f2b320c93 100644
--- a/artiq/firmware/libboard/sdram.rs
+++ b/artiq/firmware/libboard/sdram.rs
@@ -207,7 +207,7 @@ mod ddr {
 
             // Get a bit further into the working zone
             #[cfg(kusddrphy)]
-            for _ in 0..8 {
+            for _ in 0..16 {
                 delay.set(delay.get() + 1);
                 ddrphy::rdly_dq_inc_write(1);
             }