diff --git a/std/experimental/allocator/mallocator.d b/std/experimental/allocator/mallocator.d
index 18a1d785f22..f50d8c1b0e1 100644
--- a/std/experimental/allocator/mallocator.d
+++ b/std/experimental/allocator/mallocator.d
@@ -240,7 +240,7 @@ struct AlignedMallocator
         free(b.ptr);
         return true;
     }
-    else version (Windows) @system
+    else version (Windows) @system @nogc
     bool deallocate(void[] b) shared
     {
         _aligned_free(b.ptr);