diff --git a/OpenSim/Region/ScriptEngine/Interfaces/IScriptApi.cs b/OpenSim/Region/ScriptEngine/Interfaces/IScriptApi.cs
index d2323f56d1..30e99b0d74 100644
--- a/OpenSim/Region/ScriptEngine/Interfaces/IScriptApi.cs
+++ b/OpenSim/Region/ScriptEngine/Interfaces/IScriptApi.cs
@@ -46,6 +46,6 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
         /// <param name='item'>/param>
         /// <param name='coopSleepHandle'>/param>
         void Initialize(
-            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, EventWaitHandle coopSleepHandle);
+            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, WaitHandle coopSleepHandle);
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 6def207345..a776bd88b1 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -90,7 +90,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         /// Used for script sleeps when we are using co-operative script termination.
         /// </summary>
         /// <remarks>null if co-operative script termination is not active</remarks>  
-        EventWaitHandle m_coopSleepHandle;       
+        WaitHandle m_coopSleepHandle;       
 
         /// <summary>
         /// The item that hosts this script
@@ -115,7 +115,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         protected int EMAIL_PAUSE_TIME = 20;  // documented delay value for smtp.
 
         public void Initialize(
-            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, EventWaitHandle coopSleepHandle)
+            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, WaitHandle coopSleepHandle)
         {
             m_ScriptEngine = scriptEngine;
             m_host = host;
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LS_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LS_Api.cs
index 5c16b567d6..b399ce93b3 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LS_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LS_Api.cs
@@ -63,7 +63,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         internal IScriptModuleComms m_comms = null;
 
         public void Initialize(
-            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, EventWaitHandle coopSleepHandle)
+            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, WaitHandle coopSleepHandle)
         {
             m_ScriptEngine = scriptEngine;
             m_host = host;
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/MOD_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/MOD_Api.cs
index 44102e679e..a58ad87cda 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/MOD_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/MOD_Api.cs
@@ -63,7 +63,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         internal IScriptModuleComms m_comms = null;
 
         public void Initialize(
-            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, EventWaitHandle coopSleepHandle)
+            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, WaitHandle coopSleepHandle)
         {
             m_ScriptEngine = scriptEngine;
             m_host = host;
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index 2f80595d7c..280fea63e6 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -142,7 +142,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         protected IUrlModule m_UrlModule = null;
 
         public void Initialize(
-            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, EventWaitHandle coopSleepHandle)
+            IScriptEngine scriptEngine, SceneObjectPart host, TaskInventoryItem item, WaitHandle coopSleepHandle)
         {
             m_ScriptEngine = scriptEngine;
             m_host = host;