diff --git a/library/bignum.c b/library/bignum.c
index f06eff0..7c0033e 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -1785,7 +1785,7 @@
     /*
      * handle trivial cases
      */
-    if( b == 1 )
+    if( b == 1 || A->n == 0 )
     {
         *r = 0;
         return( 0 );