diff --git a/src/mem/allocconfig.h b/src/mem/allocconfig.h
index fd7fb53..01bc1d0 100644
--- a/src/mem/allocconfig.h
+++ b/src/mem/allocconfig.h
@@ -110,6 +110,8 @@ namespace snmalloc
   static constexpr size_t SUPERSLAB_BITS = SLAB_BITS + SLAB_COUNT_BITS;
   static constexpr size_t RESERVE_SIZE = SUPERSLAB_SIZE * RESERVE_MULTIPLE;
 
+  static_assert((1ULL << SUPERSLAB_BITS) == SUPERSLAB_SIZE, "Sanity check");
+
   // Number of slots for remote deallocation.
   static constexpr size_t REMOTE_SLOT_BITS = 6;
   static constexpr size_t REMOTE_SLOTS = 1 << REMOTE_SLOT_BITS;
diff --git a/src/mem/sizeclass.h b/src/mem/sizeclass.h
index 1561df2..36136f8 100644
--- a/src/mem/sizeclass.h
+++ b/src/mem/sizeclass.h
@@ -35,7 +35,7 @@ namespace snmalloc
     size_to_sizeclass_const((size_t)1 << SLAB_BITS) + 1;
 
   static constexpr size_t NUM_SIZECLASSES =
-    size_to_sizeclass_const((size_t)1 << SUPERSLAB_BITS);
+    size_to_sizeclass_const(SUPERSLAB_SIZE);
 
   // Medium classes range from (SLAB, SUPERSLAB), i.e. non-inclusive.
   static constexpr size_t NUM_MEDIUM_CLASSES =
@@ -45,14 +45,6 @@ namespace snmalloc
   static constexpr size_t NUM_LARGE_CLASSES =
     bits::ADDRESS_BITS - SUPERSLAB_BITS;
 
-  template<size_t X, size_t Y>
-  constexpr void check_same()
-  {
-    static_assert(X == Y, "Values must be the same");
-  }
-
-  static_assert(size_to_sizeclass_const(SUPERSLAB_SIZE) == NUM_SIZECLASSES);
-
   inline static size_t round_by_sizeclass(size_t rsize, size_t offset)
   {
     //    check_same<NUM_LARGE_CLASSES, Globals::num_large_classes>();