diff --git a/src/alloy/backend/ivm/ivm_backend.cc b/src/alloy/backend/ivm/ivm_backend.cc
index 411d16d30..67703f7d4 100644
--- a/src/alloy/backend/ivm/ivm_backend.cc
+++ b/src/alloy/backend/ivm/ivm_backend.cc
@@ -38,14 +38,14 @@ int IVMBackend::Initialize() {
     0,
     "gpr",
     MachineInfo::RegisterSet::INT_TYPES,
-    6,
+    16,
   };
   machine_info_.register_sets[1] = {
     1,
     "vec",
     MachineInfo::RegisterSet::FLOAT_TYPES |
     MachineInfo::RegisterSet::VEC_TYPES,
-    6,
+    16,
   };
 
   alloy::tracing::WriteEvent(EventType::Init({