diff --git a/src/WattleScript.Interpreter/Execution/VM/Instruction.cs b/src/WattleScript.Interpreter/Execution/VM/Instruction.cs
index 056ac5d7..cd839fbc 100644
--- a/src/WattleScript.Interpreter/Execution/VM/Instruction.cs
+++ b/src/WattleScript.Interpreter/Execution/VM/Instruction.cs
@@ -19,7 +19,7 @@ internal struct Instruction
 		//32 bits
 		public int NumVal
 		{
-			get => (int) (_data >> 7);
+			get => (int) ((_data >> 7) & 0xFFFFFFFF);
 			set => _data = (_data & ~0x7fffffff80UL) | ((ulong) (uint) value) << 7;
 		}