diff --git a/std/experimental/allocator/building_blocks/quantizer.d b/std/experimental/allocator/building_blocks/quantizer.d
index b3f205dcc61..6df77e59468 100644
--- a/std/experimental/allocator/building_blocks/quantizer.d
+++ b/std/experimental/allocator/building_blocks/quantizer.d
@@ -212,14 +212,19 @@ struct Quantizer(ParentAllocator, alias roundingFunction)
 @system unittest
 {
     import std.experimental.allocator.building_blocks.free_tree : FreeTree;
-    import std.experimental.allocator.common : roundUpToMultipleOf;
     import std.experimental.allocator.gc_allocator : GCAllocator;
 
+    size_t roundUpToMultipleOf(size_t s, uint base)
+    {
+        auto rem = s % base;
+        return rem ? s + base - rem : s;
+    }
+
     // Quantize small allocations to a multiple of cache line, large ones to a
     // multiple of page size
     alias MyAlloc = Quantizer!(
         FreeTree!GCAllocator,
-        n => n.roundUpToMultipleOf(n <= 16_384 ? 64 : 4096));
+        n => roundUpToMultipleOf(n, n <= 16_384 ? 64 : 4096));
     MyAlloc alloc;
     const buf = alloc.allocate(256);
     assert(buf.ptr);