diff --git a/src/lib/nbt.cpp b/src/lib/nbt.cpp
index 3fb198e..c320291 100644
--- a/src/lib/nbt.cpp
+++ b/src/lib/nbt.cpp
@@ -336,15 +336,31 @@ namespace NBT {
         //}
 
         void writeInt32Array(std::vector<uint8_t>* destination, std::vector<int32_t> data) {
+            writeInt32(destination, data.size());
+            for(int32_t element: data){
+                writeInt32(destination, element);
+            }
         }
 
-        void writeInt32Array(std::vector<uint8_t>* destination, int32_t data[], uint64_t dataSize) {
+        void writeInt32Array(std::vector<uint8_t>* destination, int32_t data[], uint32_t dataSize) {
+            writeInt32(destination, dataSize);
+            for(uint32_t i = 0; i<dataSize; i++){
+                writeInt32(destination, data[i]);
+            }
         }
 
         void writeInt64Array(std::vector<uint8_t>* destination, std::vector<int64_t> data) {
+            writeInt32(destination, data.size());
+            for(int64_t element: data){
+                writeInt64(destination, element);
+            }
         }
 
-        void writeInt64Array(std::vector<uint8_t>* destination, int64_t data[], uint64_t dataSize) {
+        void writeInt64Array(std::vector<uint8_t>* destination, int64_t data[], uint32_t dataSize) {
+            writeInt32(destination, dataSize);
+            for(uint32_t i = 0; i<dataSize; i++){
+                writeInt64(destination, data[i]);
+            }
         }
     }
 
diff --git a/src/lib/nbt.h++ b/src/lib/nbt.h++
index 245c491..6205f6d 100644
--- a/src/lib/nbt.h++
+++ b/src/lib/nbt.h++
@@ -70,9 +70,9 @@ namespace NBT {
         void writeInt8Array(std::vector<uint8_t>* destination, int8_t data[], uint32_t dataSize);
         //void writeString(std::vector<uint8_t>* destination, <string type> data);
         void writeInt32Array(std::vector<uint8_t>* destination, std::vector<int32_t> data);
-        void writeInt32Array(std::vector<uint8_t>* destination, int32_t data[], uint64_t dataSize);
+        void writeInt32Array(std::vector<uint8_t>* destination, int32_t data[], uint32_t dataSize);
         void writeInt64Array(std::vector<uint8_t>* destination, std::vector<int64_t> data);
-        void writeInt64Array(std::vector<uint8_t>* destination, int64_t data[], uint64_t dataSize);
+        void writeInt64Array(std::vector<uint8_t>* destination, int64_t data[], uint32_t dataSize);
     }
 
     bool validateRawNBTData(uint8_t data[], int length);
diff --git a/src/test/nbt_helpers.cpp b/src/test/nbt_helpers.cpp
index c2eabcc..3351794 100644
--- a/src/test/nbt_helpers.cpp
+++ b/src/test/nbt_helpers.cpp
@@ -256,7 +256,44 @@ int main(){
     ASSERT(NBT::helper::readInt32Array(dataForIntArrayTest, dataSize, currentPosition).isError == true);
     ASSERT(NBT::helper::readInt32Array(dataForIntArrayTest, dataSize, currentPosition).errorCode == ErrorCodes::RANGE_ERROR);
 
-    std::cout << "Passed int32Array NBT helper test" << std::endl;
+    std::cout << "Passed readInt32Array NBT helper test" << std::endl;
+
+    std::vector<uint8_t>* int32ArrayTestOutput = new std::vector<uint8_t>();
+    int32_t input32[] = {0x01234567, 0x01234567};
+    NBT::helper::writeInt32Array(int32ArrayTestOutput, input32, 2);
+    ASSERT(
+        int32ArrayTestOutput->at(0) == 0x00 &&
+        int32ArrayTestOutput->at(1) == 0x00 &&
+        int32ArrayTestOutput->at(2) == 0x00 &&
+        int32ArrayTestOutput->at(3) == 0x02 &&
+        int32ArrayTestOutput->at(4) == 0x01 &&
+        int32ArrayTestOutput->at(5) == 0x23 &&
+        int32ArrayTestOutput->at(6) == 0x45 &&
+        int32ArrayTestOutput->at(7) == 0x67 &&
+        int32ArrayTestOutput->at(8) == 0x01 &&
+        int32ArrayTestOutput->at(9) == 0x23 &&
+        int32ArrayTestOutput->at(10) == 0x45 &&
+        int32ArrayTestOutput->at(11) == 0x67
+    );
+    int32ArrayTestOutput->clear();
+    NBT::helper::writeInt32Array(int32ArrayTestOutput, std::vector<int32_t>({0x01234567, 0x01234567}));
+    ASSERT(
+        int32ArrayTestOutput->at(0) == 0x00 &&
+        int32ArrayTestOutput->at(1) == 0x00 &&
+        int32ArrayTestOutput->at(2) == 0x00 &&
+        int32ArrayTestOutput->at(3) == 0x02 &&
+        int32ArrayTestOutput->at(4) == 0x01 &&
+        int32ArrayTestOutput->at(5) == 0x23 &&
+        int32ArrayTestOutput->at(6) == 0x45 &&
+        int32ArrayTestOutput->at(7) == 0x67 &&
+        int32ArrayTestOutput->at(8) == 0x01 &&
+        int32ArrayTestOutput->at(9) == 0x23 &&
+        int32ArrayTestOutput->at(10) == 0x45 &&
+        int32ArrayTestOutput->at(11) == 0x67
+    );
+    delete int32ArrayTestOutput;
+
+    std::cout << "Passed writeInt32Array NBT helper test" << std::endl;
 
     // int64 "array" ###################################################
     // read successfully
@@ -280,7 +317,61 @@ int main(){
     ASSERT(NBT::helper::readInt64Array(dataForIntArrayTest, dataSize, currentPosition).isError == true);
     ASSERT(NBT::helper::readInt64Array(dataForIntArrayTest, dataSize, currentPosition).errorCode == ErrorCodes::RANGE_ERROR);
 
-    std::cout << "Passed int64Array NBT helper test" << std::endl;
+    std::cout << "Passed readInt64Array NBT helper test" << std::endl;
+
+    std::vector<uint8_t>* int64ArrayTestOutput = new std::vector<uint8_t>();
+    int64_t input64[] = {0x0123456789ABCDEF, 0x0123456789ABCDEF};
+    NBT::helper::writeInt64Array(int64ArrayTestOutput, input64, 2);
+    ASSERT(
+        int64ArrayTestOutput->at(0) == 0x00 &&
+        int64ArrayTestOutput->at(1) == 0x00 &&
+        int64ArrayTestOutput->at(2) == 0x00 &&
+        int64ArrayTestOutput->at(3) == 0x02 &&
+        int64ArrayTestOutput->at(4) == 0x01 &&
+        int64ArrayTestOutput->at(5) == 0x23 &&
+        int64ArrayTestOutput->at(6) == 0x45 &&
+        int64ArrayTestOutput->at(7) == 0x67 &&
+        int64ArrayTestOutput->at(8) == 0x89 &&
+        int64ArrayTestOutput->at(9) == 0xAB &&
+        int64ArrayTestOutput->at(10) == 0xCD &&
+        int64ArrayTestOutput->at(11) == 0xEF &&
+        int64ArrayTestOutput->at(12) == 0x01 &&
+        int64ArrayTestOutput->at(13) == 0x23 &&
+        int64ArrayTestOutput->at(14) == 0x45 &&
+        int64ArrayTestOutput->at(15) == 0x67 &&
+        int64ArrayTestOutput->at(16) == 0x89 &&
+        int64ArrayTestOutput->at(17) == 0xAB &&
+        int64ArrayTestOutput->at(18) == 0xCD &&
+        int64ArrayTestOutput->at(19) == 0xEF
+    );
+    int64ArrayTestOutput->clear();
+    NBT::helper::writeInt64Array(int64ArrayTestOutput, std::vector<int64_t>({0x0123456789ABCDEF, 0x0123456789ABCDEF}));
+    ASSERT(
+        int64ArrayTestOutput->at(0) == 0x00 &&
+        int64ArrayTestOutput->at(1) == 0x00 &&
+        int64ArrayTestOutput->at(2) == 0x00 &&
+        int64ArrayTestOutput->at(3) == 0x02 &&
+        int64ArrayTestOutput->at(4) == 0x01 &&
+        int64ArrayTestOutput->at(5) == 0x23 &&
+        int64ArrayTestOutput->at(6) == 0x45 &&
+        int64ArrayTestOutput->at(7) == 0x67 &&
+        int64ArrayTestOutput->at(8) == 0x89 &&
+        int64ArrayTestOutput->at(9) == 0xAB &&
+        int64ArrayTestOutput->at(10) == 0xCD &&
+        int64ArrayTestOutput->at(11) == 0xEF &&
+        int64ArrayTestOutput->at(12) == 0x01 &&
+        int64ArrayTestOutput->at(13) == 0x23 &&
+        int64ArrayTestOutput->at(14) == 0x45 &&
+        int64ArrayTestOutput->at(15) == 0x67 &&
+        int64ArrayTestOutput->at(16) == 0x89 &&
+        int64ArrayTestOutput->at(17) == 0xAB &&
+        int64ArrayTestOutput->at(18) == 0xCD &&
+        int64ArrayTestOutput->at(19) == 0xEF &&
+        true
+    );
+    delete int64ArrayTestOutput;
+
+    std::cout << "Passed writeInt32Array NBT helper test" << std::endl;
 
     // float32 ["float" in the current implementation :( ] #############
     uint8_t dataForFloat32Test[] = {0xC7, 0x77, 0x77, 0x77};