diff --git a/include/buffer/cc_buf.h b/include/buffer/cc_buf.h
index f0d7924db..4fe111dd3 100644
--- a/include/buffer/cc_buf.h
+++ b/include/buffer/cc_buf.h
@@ -169,6 +169,10 @@ buf_read(char *dst, struct buf *src, uint32_t count)
 static inline uint32_t
 buf_write(struct buf *dst, char *src, uint32_t count)
 {
+    if (count == 0) {
+        return 0;
+    }
+
     ASSERT(dst != NULL && src != NULL);
 
     uint32_t len = MIN(buf_wsize(dst), count);
diff --git a/src/cc_print.c b/src/cc_print.c
index 22b5ee4ff..8a16430f5 100644
--- a/src/cc_print.c
+++ b/src/cc_print.c
@@ -60,7 +60,7 @@ cc_print_int64_unsafe(char *buf, int64_t n)
     }
 
     d = digits(ab);
-    _print_uint64(buf, d, n);
+    _print_uint64(buf, d, ab);
 
     return  d + (n < 0);
 }