diff --git a/tests/suites/test_suite_dhm.function b/tests/suites/test_suite_dhm.function
index ae814d3..002c20b 100644
--- a/tests/suites/test_suite_dhm.function
+++ b/tests/suites/test_suite_dhm.function
@@ -20,8 +20,8 @@
     unsigned char sec_cli[1000];
     size_t ske_len = 0;
     size_t pub_cli_len = 0;
-    size_t sec_srv_len = 1000;
-    size_t sec_cli_len = 1000;
+    size_t sec_srv_len;
+    size_t sec_cli_len;
     int x_size, i;
     rnd_pseudo_info rnd_info;
 
@@ -52,8 +52,8 @@
     TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
     TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
 
-    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
-    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, &sec_cli_len, NULL, NULL ) == 0 );
+    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ), &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
+    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ), &sec_cli_len, NULL, NULL ) == 0 );
 
     TEST_ASSERT( sec_srv_len == sec_cli_len );
     TEST_ASSERT( sec_srv_len != 0 );
@@ -63,7 +63,7 @@
     for( i = 0; i < 3; i++ )
     {
         sec_srv_len = 1000;
-        TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
+        TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ), &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
 
         TEST_ASSERT( sec_srv_len == sec_cli_len );
         TEST_ASSERT( sec_srv_len != 0 );
@@ -73,8 +73,6 @@
     /*
      * Second key exchange to test change of blinding values on server
      */
-    sec_cli_len = 1000;
-    sec_srv_len = 1000;
     p = ske;
 
     TEST_ASSERT( mbedtls_dhm_make_params( &ctx_srv, x_size, ske, &ske_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
@@ -85,8 +83,8 @@
     TEST_ASSERT( mbedtls_dhm_make_public( &ctx_cli, x_size, pub_cli, pub_cli_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
     TEST_ASSERT( mbedtls_dhm_read_public( &ctx_srv, pub_cli, pub_cli_len ) == 0 );
 
-    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
-    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, &sec_cli_len, NULL, NULL ) == 0 );
+    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_srv, sec_srv, sizeof( sec_srv ), &sec_srv_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
+    TEST_ASSERT( mbedtls_dhm_calc_secret( &ctx_cli, sec_cli, sizeof( sec_cli ), &sec_cli_len, NULL, NULL ) == 0 );
 
     TEST_ASSERT( sec_srv_len == sec_cli_len );
     TEST_ASSERT( sec_srv_len != 0 );