diff --git a/src/runtime/src/kernel/dma.rs b/src/runtime/src/kernel/dma.rs
index e39ac23..77bfaed 100644
--- a/src/runtime/src/kernel/dma.rs
+++ b/src/runtime/src/kernel/dma.rs
@@ -199,7 +199,7 @@ pub extern fn dma_playback(timestamp: i64, ptr: i32) {
             csr::rtio_dma::error_write(1);
             if error & 1 != 0 {
                 artiq_raise!("RTIOUnderflow",
-                    format!("RTIO underflow at channel {}:{}, {{0}} mu", channel, resolve_channel_name(channel as u32)),
+                    format!("RTIO underflow at {{0}} mu, channel {}:{}", channel, resolve_channel_name(channel as u32)),
                     timestamp as i64, channel as i64, 0);
             }
             if error & 2 != 0 {
diff --git a/src/runtime/src/rtio_acp.rs b/src/runtime/src/rtio_acp.rs
index 2fff41d..5ac0bbb 100644
--- a/src/runtime/src/rtio_acp.rs
+++ b/src/runtime/src/rtio_acp.rs
@@ -88,7 +88,7 @@ unsafe fn process_exceptional_status(channel: i32, status: i32) {
     }
     if status & RTIO_O_STATUS_UNDERFLOW != 0 {
         artiq_raise!("RTIOUnderflow",
-            format!("RTIO underflow at channel {}:{}, {{1}} mu, slack {{2}} mu", channel, resolve_channel_name(channel as u32)),
+            format!("RTIO underflow at {{1}} mu, channel {}:{}, slack {{2}} mu", channel, resolve_channel_name(channel as u32)),
                 channel as i64, timestamp, timestamp - get_counter());
     }
     if status & RTIO_O_STATUS_DESTINATION_UNREACHABLE != 0 {
diff --git a/src/runtime/src/rtio_csr.rs b/src/runtime/src/rtio_csr.rs
index df30106..1fce04f 100644
--- a/src/runtime/src/rtio_csr.rs
+++ b/src/runtime/src/rtio_csr.rs
@@ -73,7 +73,7 @@ unsafe fn process_exceptional_status(channel: i32, status: u8) {
     }
     if status & RTIO_O_STATUS_UNDERFLOW != 0 {
         artiq_raise!("RTIOUnderflow",
-            format!("RTIO underflow at channel {}:{}, {{1}} mu, slack {{2}} mu", channel, resolve_channel_name(channel as u32)),
+            format!("RTIO underflow at {{1}} mu, channel {}:{}, slack {{2}} mu", channel, resolve_channel_name(channel as u32)),
             channel as i64, timestamp, timestamp - get_counter());
     }
     if status & RTIO_O_STATUS_DESTINATION_UNREACHABLE != 0 {
diff --git a/src/runtime/src/rtio_mgt.rs b/src/runtime/src/rtio_mgt.rs
index beea59e..3de236f 100644
--- a/src/runtime/src/rtio_mgt.rs
+++ b/src/runtime/src/rtio_mgt.rs
@@ -348,7 +348,7 @@ fn read_device_map(cfg: &Config) -> BTreeMap<u32, String> {
             let channel = bytes_cr.read_u32().unwrap();
             let device_name = bytes_cr.read_string().unwrap();
             if let Some(old_entry) = device_map.insert(channel, device_name.clone()) {
-                error!("conflicting entries for channel {}: `{}` and `{}`",
+                error!("read_device_map: conflicting entries for channel {}: `{}` and `{}`",
                        channel, old_entry, device_name);
             }
         }