diff --git a/test/src/unit-class_parser.cpp b/test/src/unit-class_parser.cpp
index 22485048c..3b54cac47 100644
--- a/test/src/unit-class_parser.cpp
+++ b/test/src/unit-class_parser.cpp
@@ -93,7 +93,7 @@ class SaxEventLogger
 
     bool start_object(std::size_t elements)
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_object()");
         }
@@ -118,7 +118,7 @@ class SaxEventLogger
 
     bool start_array(std::size_t elements)
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_array()");
         }
diff --git a/test/src/unit-deserialization.cpp b/test/src/unit-deserialization.cpp
index 500966e9e..05fb21e3a 100644
--- a/test/src/unit-deserialization.cpp
+++ b/test/src/unit-deserialization.cpp
@@ -93,7 +93,7 @@ struct SaxEventLogger : public nlohmann::json_sax<json>
 
     bool start_object(std::size_t elements) override
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_object()");
         }
@@ -118,7 +118,7 @@ struct SaxEventLogger : public nlohmann::json_sax<json>
 
     bool start_array(std::size_t elements) override
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_array()");
         }
@@ -148,7 +148,7 @@ struct SaxEventLoggerExitAfterStartObject : public SaxEventLogger
 {
     bool start_object(std::size_t elements) override
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_object()");
         }
@@ -173,7 +173,7 @@ struct SaxEventLoggerExitAfterStartArray : public SaxEventLogger
 {
     bool start_array(std::size_t elements) override
     {
-        if (elements == std::size_t(-1))
+        if (elements == reinterpret_cast<std::size_t>(-1))
         {
             events.emplace_back("start_array()");
         }