diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c

index 1a80b2b..b997e23 100644

--- a/ext/fiddle/closure.c

+++ b/ext/fiddle/closure.c

@@ -13,22 +13,11 @@ typedef struct {

     ffi_type **argv;

 } fiddle_closure;

-#if defined(USE_FFI_CLOSURE_ALLOC)

-#elif !defined(HAVE_FFI_CLOSURE_ALLOC)

-# define USE_FFI_CLOSURE_ALLOC 0

-#else

-# define USE_FFI_CLOSURE_ALLOC 1

-#endif

-

 static void

 dealloc(void * ptr)

 {

     fiddle_closure * cls = (fiddle_closure *)ptr;

-#if USE_FFI_CLOSURE_ALLOC

     ffi_closure_free(cls->pcl);

-#else

-    munmap(cls->pcl, sizeof(*cls->pcl));

-#endif

     if (cls->argv) xfree(cls->argv);

     xfree(cls);

 }

@@ -202,12 +188,7 @@ allocate(VALUE klass)

     VALUE i = TypedData_Make_Struct(klass, fiddle_closure,

 	    &closure_data_type, closure);

-#if USE_FFI_CLOSURE_ALLOC

     closure->pcl = ffi_closure_alloc(sizeof(ffi_closure), &closure->code);

-#else

-    closure->pcl = mmap(NULL, sizeof(ffi_closure), PROT_READ | PROT_WRITE,

-        MAP_ANON | MAP_PRIVATE, -1, 0);

-#endif

     return i;

 }

@@ -254,17 +238,8 @@ initialize(int rbargc, VALUE argv[], VALUE self)

     if (FFI_OK != result)

 	rb_raise(rb_eRuntimeError, "error prepping CIF %d", result);

-#if USE_FFI_CLOSURE_ALLOC

     result = ffi_prep_closure_loc(pcl, cif, callback,

 		(void *)self, cl->code);

-#else

-    result = ffi_prep_closure(pcl, cif, callback, (void *)self);

-    cl->code = (void *)pcl;

-    i = mprotect(pcl, sizeof(*pcl), PROT_READ | PROT_EXEC);

-    if (i) {

-	rb_sys_fail("mprotect");

-    }

-#endif

     if (FFI_OK != result)

 	rb_raise(rb_eRuntimeError, "error prepping closure %d", result);