diff --git a/Include/internal/pycore_long.h b/Include/internal/pycore_long.h
index 141839cf3415c9e..72589e4ec8b8205 100644
--- a/Include/internal/pycore_long.h
+++ b/Include/internal/pycore_long.h
@@ -222,25 +222,15 @@ PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
  * 2: Reserved for immortality bit
  * 3+ Unsigned digit count
  */
-#define SIGN_MASK 3
+#define SIGN_MASK _PyLong_SIGN_MASK
 #define SIGN_ZERO 1
 #define SIGN_NEGATIVE 2
-#define NON_SIZE_BITS 3
+#define NON_SIZE_BITS _PyLong_NON_SIZE_BITS
 
-/* The functions _PyLong_IsCompact and _PyLong_CompactValue are defined
- * in Include/cpython/longobject.h, since they need to be inline.
- *
- * "Compact" values have at least one bit to spare,
+/* "Compact" values have at least one bit to spare,
  * so that addition and subtraction can be performed on the values
  * without risk of overflow.
- *
- * The inline functions need tag bits.
- * For readability, rather than do `#define SIGN_MASK _PyLong_SIGN_MASK`
- * we define them to the numbers in both places and then assert that
- * they're the same.
  */
-static_assert(SIGN_MASK == _PyLong_SIGN_MASK, "SIGN_MASK does not match _PyLong_SIGN_MASK");
-static_assert(NON_SIZE_BITS == _PyLong_NON_SIZE_BITS, "NON_SIZE_BITS does not match _PyLong_NON_SIZE_BITS");
 
 /* All *compact" values are guaranteed to fit into
  * a Py_ssize_t with at least one bit to spare.