diff --git a/gcc/d/d-frontend.h b/gcc/d/d-frontend.h
index 3edf812212a..e7695d5718b 100644
--- a/gcc/d/d-frontend.h
+++ b/gcc/d/d-frontend.h
@@ -21,7 +21,7 @@ along with GCC; see the file COPYING3.  If not see
 /* These functions are defined in D runtime.  */
 extern "C" int rt_init (void);
 extern "C" int rt_term (void);
-//extern "C" void gc_disable (void);
+extern "C" void gc_disable (void);
 extern "C" void *gc_malloc (size_t sz, unsigned ba = 0, const void *ti = NULL);
 extern "C" void gc_free (void *);
 extern "C" void gc_collect (void);
diff --git a/gcc/d/d-lang.cc b/gcc/d/d-lang.cc
index d20370e5d8a..dbf7a8b60b9 100644
--- a/gcc/d/d-lang.cc
+++ b/gcc/d/d-lang.cc
@@ -288,7 +288,7 @@ d_init_options (unsigned int, cl_decoded_option *decoded_options)
 {
   /* Initialize the D runtime.  */
   rt_init ();
-//  gc_disable ();
+  gc_disable ();
 
   /* Set default values.  */
   global._init ();