diff --git a/BeefLibs/corlib/src/Threading/Monitor.bf b/BeefLibs/corlib/src/Threading/Monitor.bf
index 48b7f38d..bf0539aa 100644
--- a/BeefLibs/corlib/src/Threading/Monitor.bf
+++ b/BeefLibs/corlib/src/Threading/Monitor.bf
@@ -5,7 +5,7 @@ namespace System.Threading
 {    
     public class Monitor
     {
-        public struct MonitorLockInstance
+        public struct MonitorLockInstance : IDisposable
         {
             public Monitor mMonitor;
             public void Dispose()
diff --git a/IDE/mintest/minlib/src/System/Threading/Monitor.bf b/IDE/mintest/minlib/src/System/Threading/Monitor.bf
index 47a4ad46..16ac6e78 100644
--- a/IDE/mintest/minlib/src/System/Threading/Monitor.bf
+++ b/IDE/mintest/minlib/src/System/Threading/Monitor.bf
@@ -26,7 +26,7 @@ namespace System.Threading
 
     public class Monitor
     {
-		public struct MonitorLockInstance
+		public struct MonitorLockInstance : IDisposable
 		{
 		    public Monitor mMonitor;
 		    public void Dispose()