1 files changed, 1 insertions, 0 deletions
diff --git a/src/real_mode/mod.rs b/src/real_mode/mod.rs
index 930d450..3fbb99a 100644
--- a/src/real_mode/mod.rs
+++ b/src/real_mode/mod.rs
@@ -8128,6 +8128,7 @@ fn read_operands<
                         match m {
                             0b000 => {
                                 instruction.opcode = Opcode::MONITOR;
+                                instruction.mem_size = 1;
                             }
                             0b001 => {
                                 instruction.opcode = Opcode::MWAIT;