diff --git a/library/constant_time.c b/library/constant_time.c
index 552a918..c823b78 100644
--- a/library/constant_time.c
+++ b/library/constant_time.c
@@ -316,40 +316,6 @@
 
 #if defined(MBEDTLS_BIGNUM_C)
 
-/** Select between two sign values without branches.
- *
- * This is functionally equivalent to `condition ? if1 : if0` but uses only bit
- * operations in order to avoid branches.
- *
- * \note if1 and if0 must be either 1 or -1, otherwise the result
- *       is undefined.
- *
- * \param condition     Condition to test; must be either 0 or 1.
- * \param if1           The first sign; must be either +1 or -1.
- * \param if0           The second sign; must be either +1 or -1.
- *
- * \return  \c if1 if \p condition is nonzero, otherwise \c if0.
- * */
-static int mbedtls_ct_cond_select_sign(unsigned char condition,
-                                       int if1,
-                                       int if0)
-{
-    /* In order to avoid questions about what we can reasonably assume about
-     * the representations of signed integers, move everything to unsigned
-     * by taking advantage of the fact that if1 and if0 are either +1 or -1. */
-    unsigned uif1 = if1 + 1;
-    unsigned uif0 = if0 + 1;
-
-    /* condition was 0 or 1, mask is 0 or 2 as are uif1 and uif0 */
-    const unsigned mask = condition << 1;
-
-    /* select uif1 or uif0 */
-    unsigned ur = (uif0 & ~mask) | (uif1 & mask);
-
-    /* ur is now 0 or 2, convert back to -1 or +1 */
-    return (int) ur - 1;
-}
-
 void mbedtls_ct_mpi_uint_cond_assign(size_t n,
                                      mbedtls_mpi_uint *dest,
                                      const mbedtls_mpi_uint *src,
@@ -754,7 +720,7 @@
 
     MBEDTLS_MPI_CHK(mbedtls_mpi_grow(X, Y->n));
 
-    X->s = mbedtls_ct_cond_select_sign(assign, Y->s, X->s);
+    X->s = (int) mbedtls_ct_uint_if(assign, Y->s, X->s);
 
     mbedtls_mpi_core_cond_assign(X->p, Y->p, Y->n, assign);
 
@@ -789,8 +755,8 @@
     MBEDTLS_MPI_CHK(mbedtls_mpi_grow(Y, X->n));
 
     s = X->s;
-    X->s = mbedtls_ct_cond_select_sign(swap, Y->s, X->s);
-    Y->s = mbedtls_ct_cond_select_sign(swap, s, Y->s);
+    X->s = (int) mbedtls_ct_uint_if(swap, Y->s, X->s);
+    Y->s = (int) mbedtls_ct_uint_if(swap, s, Y->s);
 
     mbedtls_mpi_core_cond_swap(X->p, Y->p, X->n, swap);