diff --git a/src/test/nbt_read_write_helpers.cpp b/src/test/nbt_read_write_helpers.cpp
index 81d3a86..323fea8 100644
--- a/src/test/nbt_read_write_helpers.cpp
+++ b/src/test/nbt_read_write_helpers.cpp
@@ -574,7 +574,7 @@ int main(){
     ASSERT(javaStdString1 == *exportedString);
 
     //check that we get an error when trying to write a string that is too long
-    std::string overrunString = std::string(0xFFFFF, '.');
+    std::string overrunString = std::string(0x10000, '.');
     ASSERT(NBT::Helper::writeString(exportedString, tiny_utf8::string(overrunString)).isError);
     ASSERT(NBT::Helper::writeString(exportedString, tiny_utf8::string(overrunString)).errorCode == ErrorCodes::OVERRUN);