1 files changed, 9 insertions, 6 deletions
diff --git a/big.c b/big.c
index 022b49d..d1cff5f 100644
--- a/big.c
+++ b/big.c
@@ -88,13 +88,16 @@ long long get_int(word x)
   return (sign ? -n : n);
 }
 
-word bignegate(x)
-word x;
+word bignegate(word x)
 {
-  if (bigzero(x))
-    return (x);
-  return (make
-	  (INT, hd[x] & SIGNBIT ? hd[x] & MAXDIGIT : SIGNBIT | hd[x], tl[x]));
+  if (bigzero(x)) {
+    return x;
+  }
+
+  if (hd[x] & SIGNBIT) {
+    return make(INT, hd[x] & MAXDIGIT, tl[x]);
+  }
+  return make(INT, SIGNBIT | hd[x], tl[x]);
 }
 
 word bigplus(x, y)