diff --git a/test/src/unit-cbor.cpp b/test/src/unit-cbor.cpp
index d67745e75..95a2c8885 100644
--- a/test/src/unit-cbor.cpp
+++ b/test/src/unit-cbor.cpp
@@ -610,7 +610,7 @@ TEST_CASE("CBOR")
 
                 SECTION("-32768..-129 (int 16)")
                 {
-                    for (int16_t i = -32768; i <= int16_t(-129); ++i)
+                    for (int16_t i = -32768; i <= static_cast<std::int16_t>(-129); ++i)
                     {
                         CAPTURE(i)
 
diff --git a/test/src/unit-msgpack.cpp b/test/src/unit-msgpack.cpp
index 0ac9e30c1..e593c364c 100644
--- a/test/src/unit-msgpack.cpp
+++ b/test/src/unit-msgpack.cpp
@@ -446,7 +446,7 @@ TEST_CASE("MessagePack")
 
                 SECTION("-32768..-129 (int 16)")
                 {
-                    for (int16_t i = -32768; i <= int16_t(-129); ++i)
+                    for (int16_t i = -32768; i <= static_cast<std::int16_t>(-129); ++i)
                     {
                         CAPTURE(i)