diff --git a/src/chunk.zig b/src/chunk.zig
index 3f8b2f6..eb002d6 100644
--- a/src/chunk.zig
+++ b/src/chunk.zig
@@ -176,6 +176,8 @@ pub const Chunk = struct {
             return try simpleInstruction(stdout, "OP_TRUE", index);
         } else if (instruction == OpCode.False) {
             return try simpleInstruction(stdout, "OP_FALSE", index);
+        } else if (instruction == OpCode.Not) {
+            return try simpleInstruction(stdout, "OP_NOT", index);
         } else {
             try stdout.print("Unknown opcode: {}\n", instruction);
             return index + 1;