diff --git a/vm/factor.cpp b/vm/factor.cpp
index 89da7a2db7..60508e8a27 100755
--- a/vm/factor.cpp
+++ b/vm/factor.cpp
@@ -15,7 +15,9 @@ void factor_vm::default_parameters(vm_parameters *p)
 	p->datastack_size = 32 * sizeof(cell);
 	p->retainstack_size = 32 * sizeof(cell);
 
-#ifdef FACTOR_PPC
+#if defined(__OpenBSD__) && defined(FACTOR_X86)
+	p->callstack_size = 64 * sizeof(cell);
+#elif defined(FACTOR_PPC)
 	p->callstack_size = 256 * sizeof(cell);
 #else
 	p->callstack_size = 128 * sizeof(cell);