diff --git a/tests/rp/src/bin/flash.rs b/tests/rp/src/bin/flash.rs
index 51371963e..897e3804f 100644
--- a/tests/rp/src/bin/flash.rs
+++ b/tests/rp/src/bin/flash.rs
@@ -5,6 +5,7 @@
 use defmt::*;
 use embassy_executor::Spawner;
 use embassy_rp::flash::{ERASE_SIZE, FLASH_BASE};
+use embassy_time::{Duration, Timer};
 use {defmt_rtt as _, panic_probe as _};
 
 const ADDR_OFFSET: u32 = 0x4000;
@@ -14,6 +15,12 @@ async fn main(_spawner: Spawner) {
     let p = embassy_rp::init(Default::default());
     info!("Hello World!");
 
+    // add some delay to give an attached debug probe time to parse the
+    // defmt RTT header. Reading that header might touch flash memory, which
+    // interferes with flash write operations.
+    // https://github.com/knurling-rs/defmt/pull/683
+    Timer::after(Duration::from_millis(10)).await;
+
     let mut flash = embassy_rp::flash::Flash::<_, { 2 * 1024 * 1024 }>::new(p.FLASH);
 
     let mut buf = [0u8; ERASE_SIZE];