diff --git a/Source/Scheduling/GenericTimeSource.cs b/Source/Scheduling/GenericTimeSource.cs
index cdea585..cc54cfe 100644
--- a/Source/Scheduling/GenericTimeSource.cs
+++ b/Source/Scheduling/GenericTimeSource.cs
@@ -92,8 +92,11 @@ namespace Nuclex.Support.Scheduling {
       // Force a timeout at least each second so the caller can check the system time
       // since we're not able to provide the DateTimeAdjusted notification
       int milliseconds = (int)(ticks / TicksPerMillisecond);
+#if WINDOWS
       bool signalled = waitHandle.WaitOne(Math.Min(1000, milliseconds), false);
-
+#else
+      bool signalled = waitHandle.WaitOne(Math.Min(1000, milliseconds));
+#endif
       // See whether the system date/time have been adjusted while we were asleep.
       checkForTimeAdjustment();
 
diff --git a/Source/Scheduling/WindowsTimeSource.cs b/Source/Scheduling/WindowsTimeSource.cs
index f3f01f3..e40b5c1 100644
--- a/Source/Scheduling/WindowsTimeSource.cs
+++ b/Source/Scheduling/WindowsTimeSource.cs
@@ -65,7 +65,11 @@ namespace Nuclex.Support.Scheduling {
     ///   True if the WaitHandle was signalled, false if the timeout was reached
     /// </returns>
     public override bool WaitOne(AutoResetEvent waitHandle, long ticks) {
+#if WINDOWS
       return waitHandle.WaitOne((int)(ticks / TicksPerMillisecond), false);
+#else
+      return waitHandle.WaitOne((int)(ticks / TicksPerMillisecond));
+#endif
     }
 
     /// <summary>
diff --git a/Source/Tracking/Transaction.cs b/Source/Tracking/Transaction.cs
index b77c542..2802bc1 100644
--- a/Source/Tracking/Transaction.cs
+++ b/Source/Tracking/Transaction.cs
@@ -164,7 +164,11 @@ namespace Nuclex.Support.Tracking {
         return true;
       }
 
+#if WINDOWS
       return WaitHandle.WaitOne(timeoutMilliseconds, false);
+#else
+      return WaitHandle.WaitOne(timeoutMilliseconds);
+#endif
     }
 
     /// <summary>Whether the transaction has ended already</summary>