diff --git a/src/alloy/backend/ivm/ivm_function.cc b/src/alloy/backend/ivm/ivm_function.cc
index e5ee570e8..84e31507f 100644
--- a/src/alloy/backend/ivm/ivm_function.cc
+++ b/src/alloy/backend/ivm/ivm_function.cc
@@ -103,8 +103,11 @@ void IVMFunction::OnBreakpointHit(ThreadState* thread_state, IntCode* i) {
 
 int IVMFunction::CallImpl(ThreadState* thread_state, uint64_t return_address) {
   // Setup register file on stack.
+  const size_t max_stack_alloc = 16 * 1024;
   size_t register_file_size = register_count_ * sizeof(Register);
-  Register* register_file = (Register*)alloca(register_file_size);
+  Register* register_file = (Register*)(
+      register_file_size >= max_stack_alloc ?
+      xe_malloc(register_file_size) : alloca(register_file_size));
 
   Memory* memory = thread_state->memory();
 
@@ -148,5 +151,9 @@ int IVMFunction::CallImpl(ThreadState* thread_state, uint64_t return_address) {
     }
   }
 
+  if (register_file_size >= max_stack_alloc) {
+    xe_free(register_file);
+  }
+
   return 0;
 }