1 files changed, 1 insertions, 0 deletions
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 264e2d3..5123ff5 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -8288,6 +8288,7 @@ fn read_operands<
                         match m {
                             0b000 => {
                                 instruction.opcode = Opcode::MONITOR;
+                                instruction.mem_size = 1;
                             }
                             0b001 => {
                                 instruction.opcode = Opcode::MWAIT;