diff --git a/.gitignore b/.gitignore
index 2de5750..7ab75ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 tests/test_box_and_client
 tests/test_dsl
+tests/test_timer
diff --git a/src/syndicate/drivers/timers.nim b/src/syndicate/drivers/timers.nim
index 3a29b48..a4d3ef0 100644
--- a/src/syndicate/drivers/timers.nim
+++ b/src/syndicate/drivers/timers.nim
@@ -1,25 +1,25 @@
 # SPDX-License-Identifier: ISC
 
-import std/[asyncdispatch, times]
+import std/[asyncdispatch, monotimes, times]
 import preserves, preserves/records
 import syndicate
 
 const TimeLaterThan* = RecordClass(label: symbol"TimeLaterThan", arity: 1)
 
-proc toPreserveHook*(time: Time): Preserve =
-  %time.toUnixFloat
+proc toPreserveHook*(time: Monotime): Preserve =
+  %time.ticks
 
-proc fromPreserveHook*(result: var Time; p: Preserve) =
-  if p.kind != pkDouble:
+proc fromPreserveHook*(result: var Monotime; p: Preserve) =
+  if p.kind != pkSignedInteger:
     raise newException(ValueError, "not a preserved time: " & $p)
-  result = fromUnixFloat(p.double)
+  result = cast[MonoTime]((p.int.int64,))
 
 syndicate timerDriver:
 
   spawn "timer":
-    during(Observe % (TimeLaterThan % `?*`)) do (deadline: Time):
+    during(Observe % (TimeLaterThan % `?*`)) do (deadline: MonoTime):
       let
-        now = getTime()
+        now = getMonoTime()
         period = inMilliseconds(deadline - now)
       if period > 0:
         getCurrentFacet().beginExternalTask()
diff --git a/tests/test_timer.nim b/tests/test_timer.nim
index f94b52c..2fd5360 100644
--- a/tests/test_timer.nim
+++ b/tests/test_timer.nim
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: ISC
 
-import std/[asyncdispatch, times]
+import std/[asyncdispatch, monotimes, times]
 import preserves, preserves/records
 import syndicate
 
@@ -10,14 +10,14 @@ syndicate plainTimerDemo:
   boot timerDriver
 
   spawn "laterThanDemo":
-    field(deadline, Time, getTime())
+    field(deadline, MonoTime, getMonoTime())
     field(count, int, 0)
 
     onAsserted(TimeLaterThan % deadline.get) do ():
       echo "TimeLaterThan ticked for deadline ", deadline.get
       count.set(count.get.succ)
       if count.get < 5:
-        deadline.set(deadline.get + 500.milliseconds)
+        deadline.set(getMonoTime() + initDuration(milliseconds = 500))
 
     onStop:
       echo "dataspace stopped"