diff --git a/src/test/nbt_read_write_helpers.cpp b/src/test/nbt_read_write_helpers.cpp
index cd08330..02b5b54 100644
--- a/src/test/nbt_read_write_helpers.cpp
+++ b/src/test/nbt_read_write_helpers.cpp
@@ -490,9 +490,10 @@ int main(){
 
     tiny_utf8::string normalString = tiny_utf8::string(normalStdString);
 
-    ASSERT(normalString == NBT::helper::readString(reinterpret_cast<uint8_t*>(javaStdString.data()), 0x75, 0).value)
-    ASSERT(NBT::helper::readString(reinterpret_cast<uint8_t*>(javaStdString.data()), 0xFFFFF, 0).errorCode == ErrorCodes::OVERRUN);
-    ASSERT(NBT::helper::readString(reinterpret_cast<uint8_t*>(javaStdString.data()), 0xF, 0).errorCode == ErrorCodes::MISMATCHEDSIZE);
+    ASSERT(normalString == NBT::helper::readString(reinterpret_cast<uint8_t*>(javaStdString.data()), javaStdString.size(), 0).value)
+
+    javaStdString[0] = '1';
+    ASSERT(NBT::helper::readString(reinterpret_cast<uint8_t*>(javaStdString.data()), javaStdString.size(), 0).errorCode == ErrorCodes::OVERRUN);
     std::cout << "Passed readString NBT helper test." << std::endl;
     delete nextChar;