diff --git a/Example Programs/C# Interop/Clock.asm b/Example Programs/C# Interop/Clock.asm
index 38007f9..2b2d9d0 100644
--- a/Example Programs/C# Interop/Clock.asm	
+++ b/Example Programs/C# Interop/Clock.asm	
@@ -14,7 +14,7 @@ ASMX_LDA :ASSEMBLY_NAME
 
 :CLOCK_LOOP
 CallExternalFunction(:CLOCK_METHOD_NAME, :&DATETIME_FORMAT)
-CallExternalFunction(:SLEEP_METHOD_NAME, 500)  ; 500ms/0.5s
+EXTD_SLP 500  ; 500ms/0.5s
 
 WCC '\r'  ; Return to start of line
 
@@ -26,9 +26,6 @@ JMP :CLOCK_LOOP
 :CLOCK_METHOD_NAME
 %DAT "PrintFormattedDateTime\0"
 
-:SLEEP_METHOD_NAME
-%DAT "Sleep\0"
-
 :DATETIME_FORMAT
 %DAT "yyyy-MM-dd HH:mm:ss\0"
 
diff --git a/Example Programs/C# Interop/Clock.cs b/Example Programs/C# Interop/Clock.cs
index 26c5872..3439a97 100644
--- a/Example Programs/C# Interop/Clock.cs	
+++ b/Example Programs/C# Interop/Clock.cs	
@@ -22,13 +22,4 @@ public static void PrintFormattedDateTime(byte[] memory, ulong[] registers, ulon
         string format = GetStringFromMemory(memory, passedValue.Value);
         Console.Write(DateTime.Now.ToString(format, System.Globalization.CultureInfo.InvariantCulture));
     }
-    
-    public static void Sleep(byte[] memory, ulong[] registers, ulong? passedValue)
-    {
-        if (passedValue is null)
-        {
-            throw new ArgumentException("This method requires a number of milliseconds to sleep");
-        }
-        System.Threading.Thread.Sleep((int)passedValue);
-    }
 }