diff --git a/libguile/arrays.c b/libguile/arrays.c
index 8dc1d7888..b4838e7e3 100644
--- a/libguile/arrays.c
+++ b/libguile/arrays.c
@@ -56,9 +56,9 @@
 
 scm_t_bits scm_i_tc16_array;
 #define SCM_SET_ARRAY_CONTIGUOUS_FLAG(x) \
-  (SCM_SET_CELL_WORD_0 ((x), SCM_CELL_WORD_0 (x) | SCM_I_ARRAY_FLAG_CONTIGUOUS))
+  (SCM_SET_SMOB_FLAGS ((x), SCM_SMOB_FLAGS (x) | SCM_I_ARRAY_FLAG_CONTIGUOUS))
 #define SCM_CLR_ARRAY_CONTIGUOUS_FLAG(x) \
-  (SCM_SET_CELL_WORD_0 ((x), SCM_CELL_WORD_0 (x) & ~SCM_I_ARRAY_FLAG_CONTIGUOUS))
+  (SCM_SET_SMOB_FLAGS ((x), SCM_SMOB_FLAGS (x) & ~SCM_I_ARRAY_FLAG_CONTIGUOUS))
 
 
 SCM_DEFINE (scm_shared_array_root, "shared-array-root", 1, 0, 0, 
diff --git a/libguile/arrays.h b/libguile/arrays.h
index 35e5471bf..325bb9cda 100644
--- a/libguile/arrays.h
+++ b/libguile/arrays.h
@@ -65,13 +65,13 @@ typedef struct scm_i_t_array
 
 SCM_API scm_t_bits scm_i_tc16_array;
 
-#define SCM_I_ARRAY_FLAG_CONTIGUOUS (1 << 16)
+#define SCM_I_ARRAY_FLAG_CONTIGUOUS (1 << 0)
 
 #define SCM_I_ARRAYP(a)	    SCM_TYP16_PREDICATE (scm_i_tc16_array, a)
-#define SCM_I_ARRAY_NDIM(x)  ((size_t) (SCM_CELL_WORD_0 (x) >> 17))
-#define SCM_I_ARRAY_CONTP(x) (SCM_CELL_WORD_0(x) & SCM_I_ARRAY_FLAG_CONTIGUOUS)
+#define SCM_I_ARRAY_NDIM(x)  ((size_t) (SCM_SMOB_FLAGS (x)>>1))
+#define SCM_I_ARRAY_CONTP(x) (SCM_SMOB_FLAGS(x) & SCM_I_ARRAY_FLAG_CONTIGUOUS)
 
-#define SCM_I_ARRAY_MEM(a)  ((scm_i_t_array *) SCM_CELL_WORD_1 (a))
+#define SCM_I_ARRAY_MEM(a)  ((scm_i_t_array *) SCM_SMOB_DATA_1 (a))
 #define SCM_I_ARRAY_V(a)    (SCM_I_ARRAY_MEM (a)->v)
 #define SCM_I_ARRAY_BASE(a) (SCM_I_ARRAY_MEM (a)->base)
 #define SCM_I_ARRAY_DIMS(a) \