1 files changed, 1 insertions, 1 deletions
diff --git a/pack.c b/pack.c
index 6befada66d..39a5922661 100644
--- a/pack.c
+++ b/pack.c
@@ -1221,7 +1221,7 @@ hex2num(char c)
 } while (0)
 
 #define PACK_ITEM_ADJUST() do { \
-    if (tmp_len > 0) \
+    if (tmp_len > 0 && !block_p) \
 	rb_ary_store(ary, RARRAY_LEN(ary)+tmp_len-1, Qnil); \
 } while (0)