diff --git a/src/device_trezor/trezor/transport.cpp b/src/device_trezor/trezor/transport.cpp
index 194176413..7a79d8f95 100644
--- a/src/device_trezor/trezor/transport.cpp
+++ b/src/device_trezor/trezor/transport.cpp
@@ -573,8 +573,13 @@ namespace trezor{
       std::string req = "PINGPING";
       char res[8];
 
-      m_socket->send_to(boost::asio::buffer(req.c_str(), req.size()), m_endpoint);
-      receive(res, 8, nullptr, false, timeout);
+      const auto written = m_socket->send_to(boost::asio::buffer(req.c_str(), req.size()), m_endpoint);
+      if (written != req.size())
+        return false;
+      memset(res, 0, sizeof(res));
+      const auto received = receive(res, 8, nullptr, false, timeout);
+      if (received != 8)
+        return false;
 
       return memcmp(res, "PONGPONG", 8) == 0;
 
diff --git a/tests/unit_tests/multiexp.cpp b/tests/unit_tests/multiexp.cpp
index 722c568da..212aa0e40 100644
--- a/tests/unit_tests/multiexp.cpp
+++ b/tests/unit_tests/multiexp.cpp
@@ -260,7 +260,7 @@ TEST(multiexp, scalarmult_triple)
   rct::key res;
   ge_p3 Gp3;
 
-  ge_frombytes_vartime(&Gp3, rct::G.bytes);
+  ASSERT_EQ(ge_frombytes_vartime(&Gp3, rct::G.bytes), 0);
 
   static const rct::key scalars[] = {
     rct::Z,
diff --git a/tests/unit_tests/tx_proof.cpp b/tests/unit_tests/tx_proof.cpp
index c5d06bc68..0adb8713e 100644
--- a/tests/unit_tests/tx_proof.cpp
+++ b/tests/unit_tests/tx_proof.cpp
@@ -58,14 +58,14 @@ TEST(tx_proof, prove_verify_v2)
     // R_B = rB
     crypto::public_key R_B;
     ge_p3 B_p3;
-    ge_frombytes_vartime(&B_p3,&B);
+    ASSERT_EQ(ge_frombytes_vartime(&B_p3,&B), 0);
     ge_p2 R_B_p2;
     ge_scalarmult(&R_B_p2, &unwrap(r), &B_p3);
     ge_tobytes(&R_B, &R_B_p2);
 
     // R_G = rG
     crypto::public_key R_G;
-    ge_frombytes_vartime(&B_p3,&B);
+    ASSERT_EQ(ge_frombytes_vartime(&B_p3,&B), 0);
     ge_p3 R_G_p3;
     ge_scalarmult_base(&R_G_p3, &unwrap(r));
     ge_p3_tobytes(&R_G, &R_G_p3);
@@ -73,7 +73,7 @@ TEST(tx_proof, prove_verify_v2)
     // D = rA
     crypto::public_key D;
     ge_p3 A_p3;
-    ge_frombytes_vartime(&A_p3,&A);
+    ASSERT_EQ(ge_frombytes_vartime(&A_p3,&A), 0);
     ge_p2 D_p2;
     ge_scalarmult(&D_p2, &unwrap(r), &A_p3);
     ge_tobytes(&D, &D_p2);