diff --git a/artiq/runtime.rs/src/clock.rs b/artiq/runtime.rs/src/clock.rs
index 3c203a196..40e56eea9 100644
--- a/artiq/runtime.rs/src/clock.rs
+++ b/artiq/runtime.rs/src/clock.rs
@@ -12,6 +12,13 @@ pub fn init() {
     }
 }
 
+pub fn get_us() -> u64 {
+    unsafe {
+        csr::timer0::update_value_write(1);
+        (INIT - csr::timer0::value_read()) / (FREQ / 1_000_000)
+    }
+}
+
 pub fn get_ms() -> u64 {
     unsafe {
         csr::timer0::update_value_write(1);
diff --git a/artiq/runtime.rs/src/logger.rs b/artiq/runtime.rs/src/logger.rs
index d09995bf7..e01248da2 100644
--- a/artiq/runtime.rs/src/logger.rs
+++ b/artiq/runtime.rs/src/logger.rs
@@ -2,6 +2,7 @@ use core::{mem, ptr};
 use core::cell::RefCell;
 use log::{self, Log, LogMetadata, LogRecord, LogLevelFilter};
 use log_buffer::LogBuffer;
+use clock;
 
 pub struct BufferLogger {
     buffer: RefCell<LogBuffer<&'static mut [u8]>>
@@ -57,10 +58,11 @@ impl Log for BufferLogger {
     fn log(&self, record: &LogRecord) {
         if self.enabled(record.metadata()) {
             use core::fmt::Write;
-            writeln!(self.buffer.borrow_mut(), "{:>5}({}): {}",
-                     record.level(), record.target(), record.args()).unwrap();
-            println!("{:>5}({}): {}",
-                     record.level(), record.target(), record.args());
+            writeln!(self.buffer.borrow_mut(),
+                     "[{:12}us] {:>5}({}): {}",
+                     clock::get_us(), record.level(), record.target(), record.args()).unwrap();
+            println!("[{:12}us] {:>5}({}): {}",
+                     clock::get_us(), record.level(), record.target(), record.args());
         }
     }
 }