diff --git a/src/backend_x64/emit_x64.cpp b/src/backend_x64/emit_x64.cpp
index fcba85b0..b0bc5215 100644
--- a/src/backend_x64/emit_x64.cpp
+++ b/src/backend_x64/emit_x64.cpp
@@ -1420,7 +1420,7 @@ void EmitX64::EmitPackedAddU8(IR::Block& block, IR::Inst* inst) {
     }
     code->xor_(result, reg_a);
     if (ge_inst) {
-        ExtractMostSignificantBitFromPackedBytes(cpu_info, code, reg_alloc, reg_ge);
+        ExtractMostSignificantBitFromPackedBytes(cpu_info, code, reg_alloc, reg_ge, tmp);
     }
 }