diff --git a/library/bignum.c b/library/bignum.c
index 6ea2f5a..f1cf808 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -999,7 +999,7 @@
          */
         cond = ct_lt_mpi_uint( Y->p[i - 1], X->p[i - 1] ) & X_is_negative;
         *ret |= cond & ( 1 - done );
-        done |= cond & ( 1 - done );
+        done |= cond;
 
         /*
          * If X->p[i - 1] < Y->p[i - 1] and both X and Y are positive, then
@@ -1011,7 +1011,7 @@
         cond = ct_lt_mpi_uint( X->p[i - 1], Y->p[i - 1] )
                & ( 1 - X_is_negative );
         *ret |= cond & ( 1 - done );
-        done |= cond & ( 1 - done );
+        done |= cond;
     }
 
     return( 0 );