diff --git a/lib/crypto/mpi/mpi-mul.c b/lib/crypto/mpi/mpi-mul.c
index 892a246216b9..7e6ff1ce3e9b 100644
--- a/lib/crypto/mpi/mpi-mul.c
+++ b/lib/crypto/mpi/mpi-mul.c
@@ -21,7 +21,7 @@ int mpi_mul(MPI w, MPI u, MPI v)
 	int usign, vsign, sign_product;
 	int assign_wp = 0;
 	mpi_ptr_t tmp_limb = NULL;
-	int err;
+	int err = 0;
 
 	if (u->nlimbs < v->nlimbs) {
 		/* Swap U and V. */