diff --git a/library/bignum.c b/library/bignum.c
index 441e4b5..cdda688 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -1180,7 +1180,7 @@
 
     ret = ret >> ( biL - 1 );
 
-    return ret;
+    return (unsigned) ret;
 }
 
 /*