diff --git a/tests/suites/test_suite_ecdh.function b/tests/suites/test_suite_ecdh.function
index e23b471..515a974 100644
--- a/tests/suites/test_suite_ecdh.function
+++ b/tests/suites/test_suite_ecdh.function
@@ -50,6 +50,9 @@
     mbedtls_ecp_keypair kp;
     int invalid_side = 42;
 
+    mbedtls_ecdh_init( &ctx );
+    mbedtls_ecp_keypair_init( &kp );
+
     TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                             mbedtls_ecdh_get_params( &ctx, &kp,
                                                      invalid_side ) );
diff --git a/tests/suites/test_suite_ecjpake.function b/tests/suites/test_suite_ecjpake.function
index 47c25e3..d90a586 100644
--- a/tests/suites/test_suite_ecjpake.function
+++ b/tests/suites/test_suite_ecjpake.function
@@ -109,6 +109,8 @@
     mbedtls_md_type_t valid_md = MBEDTLS_MD_SHA256;
     mbedtls_ecp_group_id valid_group = MBEDTLS_ECP_DP_SECP256R1;
 
+    mbedtls_ecjpake_init( &ctx );
+
     TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                             mbedtls_ecjpake_setup( &ctx,
                                                    invalid_role,
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 42d69b4..7d29e52 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -72,6 +72,9 @@
     size_t olen;
     unsigned char buf[42] = { 0 };
 
+    mbedtls_ecp_group_init( &grp );
+    mbedtls_ecp_point_init( &P );
+
     TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                             mbedtls_ecp_point_write_binary( &grp, &P,
                                                       invalid_fmt,