diff --git a/artiq/firmware/runtime/rtio_mgt.rs b/artiq/firmware/runtime/rtio_mgt.rs
index 8d35e450b..e7578d92c 100644
--- a/artiq/firmware/runtime/rtio_mgt.rs
+++ b/artiq/firmware/runtime/rtio_mgt.rs
@@ -303,3 +303,16 @@ pub mod drtio_dbg {
         }
     }
 }
+
+#[cfg(not(has_drtio))]
+pub mod drtio_dbg {
+    pub fn get_channel_state(_channel: u32) -> (u16, u64) { (0, 0) }
+
+    pub fn reset_channel_state(_channel: u32) {}
+
+    pub fn get_fifo_space(_channel: u32) {}
+
+    pub fn get_packet_counts(_linkno: u8) -> (u32, u32) { (0, 0) }
+
+    pub fn get_fifo_space_req_count(_linkno: u8) -> u32 { 0 }
+}