diff --git a/chroprof/api.nim b/chroprof/api.nim
index f332c4e..2707360 100644
--- a/chroprof/api.nim
+++ b/chroprof/api.nim
@@ -11,22 +11,18 @@ proc getMetrics*(): MetricsTotals =
   ## current thread.
   result = profilerInstance.metrics
 
-template enableProfiling*(callback: EventCallback, maxExecThreshold: Duration) =
+template enableProfiling*(callback: EventCallback, threshold: Duration) =
   ## Enables profiling for the the event loop running in the current thread.
   ## The client may optionally supply a callback to be notified of `Future`
   ## events.
-  attachMonitoring(
-      proc(e: Event) {.nimcall, gcsafe, raises: [].} =
-        profilerInstance.processEvent(e)
-        callback(e)
-      ,
-      maxExecThreshold = maxExecThreshold
-  )
+  profilerInstance.maxExecThreshold = threshold
+  proc onProfilerEvent(e: Event) {.nimcall, gcsafe, raises: [].} =
+    profilerInstance.processEvent(e)
+    callback(e)
+  attachMonitoring(onProfilerEvent)
 
-template enableProfiling*(maxExecThreshold: Duration) =
-  attachMonitoring(
-    proc(e: Event) {.nimcall, gcsafe, raises: [].} =
-      profilerInstance.processEvent(e)
-    ,
-    maxExecThreshold = maxExecThreshold
-  )
+template enableProfiling*(threshold: Duration) =
+  profilerInstance.maxExecThreshold = threshold
+  proc onProfilerEvent(e: Event) {.nimcall, gcsafe, raises: [].} =
+    profilerInstance.processEvent(e)
+  attachMonitoring(onProfilerEvent)
diff --git a/chroprof/collector.nim b/chroprof/collector.nim
index bf172ab..b77be2d 100644
--- a/chroprof/collector.nim
+++ b/chroprof/collector.nim
@@ -173,7 +173,7 @@ when defined(metrics):
 
   var asyncProfilerInfo* {.global.}: ChronosProfilerInfo
 
-  proc enableProfilerMetrics*(k: int, maxExecThreshold: Duration) =
+  proc enableProfilerMetrics*(k: int, maxExecThreshold: timer.Duration) =
     assert threadId() == moduleInitThread,
       "You cannot call enableProfilerMetrics() from a thread other than" &
         " the one that initialized the metricscolletor module."
@@ -194,5 +194,5 @@ when defined(metrics):
           if e.newState == ExtendedFutureState.Completed:
             asyncProfilerInfo.collect()
       ,
-      maxExecThreshold = maxExecThreshold
+      maxExecThreshold
     )
diff --git a/chroprof/profiler.nim b/chroprof/profiler.nim
index e056d56..94e2743 100644
--- a/chroprof/profiler.nim
+++ b/chroprof/profiler.nim
@@ -70,6 +70,7 @@ type
   MetricsTotals* = Table[FutureType, AggregateMetrics]
 
   ProfilerState* = object
+    maxExecThreshold*: Duration
     callStack: seq[uint]
     partials: Table[uint, PartialMetrics]
     metrics*: MetricsTotals
@@ -142,9 +143,9 @@ proc aggregatePartial(
   self.metrics.withValue(metrics.futureType, aggMetrics):
     let execTime = metrics.partialExecTime - metrics.partialChildrenExecOverlap
 
-    if execTime > threshold:
+    if execTime > self.maxExecThreshold:
       raiseAssert("Execution time of future is too high (" &
-        $metrics.futureType & ")" & $execTime)
+        $metrics.futureType & ") time: " & $execTime & " threshold: " & $self.maxExecThreshold)
 
     aggMetrics.callCount.inc()
     aggMetrics.execTime += execTime