diff --git a/src/c/stacks.d b/src/c/stacks.d
index 2c22a4334..9f2c6de58 100644
--- a/src/c/stacks.d
+++ b/src/c/stacks.d
@@ -486,10 +486,6 @@ si_set_limit(cl_object type, cl_object size)
 		cs_set_size(env, the_size);
 	} else if (type == @'ext::lisp-stack') {
 		ecl_stack_set_size(env, the_size);
-#ifdef GBC_BOEHM
-	} else if (type == @'ext::heap-size') {
-                si_heap_size(1, size);
-#endif
         } else {
 		_ecl_set_max_heap_size(the_size);
 	}
@@ -509,10 +505,6 @@ si_get_limit(cl_object type)
 		output = env->cs_size;
 	} else if (type == @'ext::lisp-stack') {
 		output = env->stack_size;
-#ifdef GBC_BOEHM
-	} else if (type == @'ext::heap-size') {
-                output = si_heap_size(0);
-#endif
 	} else {
 		output = cl_core.max_heap_size;
 	}