diff --git a/lib/mpi/mpi-bit.c b/lib/mpi/mpi-bit.c
index 5687248..503537e 100644
--- a/lib/mpi/mpi-bit.c
+++ b/lib/mpi/mpi-bit.c
@@ -45,7 +45,7 @@
 	if (a->nlimbs) {
 		mpi_limb_t alimb = a->d[a->nlimbs - 1];
 		if (alimb)
-			count_leading_zeros(n, alimb);
+			n = count_leading_zeros(alimb);
 		else
 			n = BITS_PER_MPI_LIMB;
 		n = BITS_PER_MPI_LIMB - n + (a->nlimbs - 1) * BITS_PER_MPI_LIMB;