diff --git a/library/bignum.c b/library/bignum.c
index d683a5e3c..441e4b570 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -1232,7 +1232,7 @@ int mbedtls_mpi_lt_mpi_ct( const mbedtls_mpi *X, const mbedtls_mpi *Y,
          */
         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
@@ -1244,7 +1244,7 @@ int mbedtls_mpi_lt_mpi_ct( const mbedtls_mpi *X, const mbedtls_mpi *Y,
         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 );