diff --git a/library/bignum_mod_raw.c b/library/bignum_mod_raw.c
index f04354d..60ff9bb 100644
--- a/library/bignum_mod_raw.c
+++ b/library/bignum_mod_raw.c
@@ -41,22 +41,22 @@
 #include "bignum_mod.h"
 #include "constant_time_internal.h"
 
-int mbedtls_mpi_mod_raw_cond_assign( mbedtls_mpi_uint *X,
-                                     mbedtls_mpi_uint *Y,
-                                     const mbedtls_mpi_mod_modulus *m,
-                                     unsigned char assign )
+void mbedtls_mpi_mod_raw_cond_assign( mbedtls_mpi_uint *X,
+                                      mbedtls_mpi_uint *Y,
+                                      const mbedtls_mpi_mod_modulus *m,
+                                      unsigned char assign )
 {
-    return mbedtls_mpi_core_cond_assign( X, m->limbs,
-                                         Y, m->limbs, assign );
+    mbedtls_mpi_core_cond_assign( X, m->limbs,
+                                  Y, m->limbs, assign );
 }
 
-int mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
-                                   mbedtls_mpi_uint *Y,
-                                   const mbedtls_mpi_mod_modulus *m,
-                                   unsigned char swap )
+void mbedtls_mpi_mod_raw_cond_swap( mbedtls_mpi_uint *X,
+                                    mbedtls_mpi_uint *Y,
+                                    const mbedtls_mpi_mod_modulus *m,
+                                    unsigned char swap )
 {
-    return mbedtls_mpi_core_cond_swap( X, m->limbs,
-                                       Y, m->limbs, swap );
+    mbedtls_mpi_core_cond_swap( X, m->limbs,
+                                Y, m->limbs, swap );
 }
 
 int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,