diff --git a/include/jwt/impl/jwt.ipp b/include/jwt/impl/jwt.ipp
index 87a8035..caec865 100644
--- a/include/jwt/impl/jwt.ipp
+++ b/include/jwt/impl/jwt.ipp
@@ -414,7 +414,7 @@ std::error_code jwt_object::verify(
     auto p_exp = payload()
                  .get_claim_value<uint64_t>(registered_claims::expiration);
 
-    if (curr_time > (p_exp + dparams.leeway)) {
+    if (static_cast<uint64_t>(curr_time) > static_cast<uint64_t>(p_exp + dparams.leeway)) {
       ec = VerificationErrc::TokenExpired;
       return ec;
     }
@@ -483,7 +483,7 @@ std::error_code jwt_object::verify(
     auto p_exp = payload()
                  .get_claim_value<uint64_t>(registered_claims::not_before);
 
-    if ((p_exp - dparams.leeway) > curr_time) {
+    if (static_cast<uint64_t>(p_exp - dparams.leeway) > static_cast<uint64_t>(curr_time)) {
       ec = VerificationErrc::ImmatureSignature;
       return ec;
     }
diff --git a/tests/test_jwt_decode.cc b/tests/test_jwt_decode.cc
index 4933665..4d8e4cb 100644
--- a/tests/test_jwt_decode.cc
+++ b/tests/test_jwt_decode.cc
@@ -34,7 +34,7 @@ TEST (DecodeTest, DecodeNoneAlgSign)
   EXPECT_TRUE (obj.has_claim("aud"));
   EXPECT_TRUE (obj.has_claim("exp"));
 
-  EXPECT_EQ (obj.payload().get_claim_value<uint64_t>("exp"), 1513863371);
+  EXPECT_EQ (obj.payload().get_claim_value<uint64_t>("exp"), static_cast<uint64_t>(1513863371));
 }
 
 TEST (DecodeTest, DecodeWrongAlgo)