diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 6144c67234..4aa388849b 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -536,7 +536,11 @@ static inline int rb_type(VALUE obj);
 
 #ifdef __GNUC__
 #define RB_GC_GUARD(v) \
-    (*__extension__ ({volatile VALUE *rb_gc_guarded_ptr = &(v); rb_gc_guarded_ptr;}))
+    (*__extension__ ({ \
+       volatile VALUE *rb_gc_guarded_ptr = &(v); \
+       __asm__("" : : "m"(rb_gc_guarded_ptr)); \
+       rb_gc_guarded_ptr; \
+    }))
 #elif defined _MSC_VER
 #pragma optimize("", off)
 static inline volatile VALUE *rb_gc_guarded_ptr(volatile VALUE *ptr) {return ptr;}
diff --git a/marshal.c b/marshal.c
index a9926acf56..7e16d0b024 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1026,7 +1026,7 @@ rb_marshal_dump_limited(VALUE obj, VALUE port, int limit)
     struct dump_arg *arg;
     VALUE wrapper; /* used to avoid memory leak in case of exception */
 
-    wrapper = TypedData_Make_Struct(rb_cData, struct dump_arg, &dump_arg_data, arg);
+    wrapper = TypedData_Make_Struct(0, struct dump_arg, &dump_arg_data, arg);
     arg->dest = 0;
     arg->symbols = st_init_numtable();
     arg->data    = rb_init_identtable();
@@ -2053,7 +2053,7 @@ rb_marshal_load_with_proc(VALUE port, VALUE proc)
     else {
        io_needed();
     }
-    wrapper = TypedData_Make_Struct(rb_cData, struct load_arg, &load_arg_data, arg);
+    wrapper = TypedData_Make_Struct(0, struct load_arg, &load_arg_data, arg);
     arg->infection = infection;
     arg->src = port;
     arg->offset = 0;