1 files changed, 1 insertions, 1 deletions
diff --git a/py/gc.c b/py/gc.c
index be35dc2cc..53a0d9da4 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -49,7 +49,7 @@
 // detect untraced object still in use
 #define CLEAR_ON_SWEEP (0)
 
-#define WORDS_PER_BLOCK ((MICROPY_BYTES_PER_GC_BLOCK) / BYTES_PER_WORD)
+#define WORDS_PER_BLOCK ((MICROPY_BYTES_PER_GC_BLOCK) / MP_BYTES_PER_OBJ_WORD)
 #define BYTES_PER_BLOCK (MICROPY_BYTES_PER_GC_BLOCK)
 
 // ATB = allocation table byte