diff --git a/tests/suites/test_suite_ecdsa.function b/tests/suites/test_suite_ecdsa.function
index 8157234f8..41beb52d4 100644
--- a/tests/suites/test_suite_ecdsa.function
+++ b/tests/suites/test_suite_ecdsa.function
@@ -599,7 +599,8 @@ void ecdsa_write_restart( int id, char *d_str, int md_alg,
     cnt_restart = 0;
     do {
         ret = mbedtls_ecdsa_write_signature_restartable( &ctx,
-                md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx );
+                md_alg, hash, hlen, sig, &slen, mbedtls_test_rnd_std_rand, NULL, 
+                &rs_ctx );
     } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart );
 
     TEST_ASSERT( ret == 0 );
@@ -614,7 +615,8 @@ void ecdsa_write_restart( int id, char *d_str, int md_alg,
     if( min_restart > 0 )
     {
         ret = mbedtls_ecdsa_write_signature_restartable( &ctx,
-                md_alg, hash, hlen, sig, &slen, NULL, NULL, &rs_ctx );
+                md_alg, hash, hlen, sig, &slen, mbedtls_test_rnd_std_rand, NULL, 
+                &rs_ctx );
         TEST_ASSERT( ret == MBEDTLS_ERR_ECP_IN_PROGRESS );
     }
 
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index bc469b68d..612796b82 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -821,7 +821,8 @@ void pk_sign_verify_restart( int pk_type, int grp_id, char *d_str,
     cnt_restart = 0;
     do {
         ret = mbedtls_pk_sign_restartable( &prv, md_alg, hash, hlen,
-                                            sig, &slen, NULL, NULL, &rs_ctx );
+                                            sig, &slen, mbedtls_test_rnd_std_rand, 
+                                            NULL, &rs_ctx );
     } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart );
 
     TEST_ASSERT( ret == 0 );
@@ -868,7 +869,8 @@ void pk_sign_verify_restart( int pk_type, int grp_id, char *d_str,
 
         slen = sizeof( sig );
         ret = mbedtls_pk_sign_restartable( &prv, md_alg, hash, hlen,
-                                            sig, &slen, NULL, NULL, &rs_ctx );
+                                            sig, &slen, mbedtls_test_rnd_std_rand, 
+                                            NULL, &rs_ctx );
         TEST_ASSERT( ret == MBEDTLS_ERR_ECP_IN_PROGRESS );
     }