diff --git a/src/lib/nbt.cpp b/src/lib/nbt.cpp
index 1c91f35..0dd3e4e 100644
--- a/src/lib/nbt.cpp
+++ b/src/lib/nbt.cpp
@@ -585,7 +585,7 @@ namespace NBT {
         // type byte + two name size bytes = 3
         uint8_t contentType = data[initialPosition + nameSize + 3];
         // type byte + two name size bytes + contained type byte + 4 length bytes = 8
-        *processedDataSize = 8;
+        *processedDataSize = (uint64_t) nameSize + 8;
         switch (contentType) {
             case TagType::END:
                 // everything except content has been touched at this point
@@ -738,11 +738,12 @@ namespace NBT {
                         // checked while trying to parse the string above
                         int16_t nameSize = helper::readInt16(data, dataSize, currentPosition+1).value;
 
-                        if (!validateRawNBTData(data, dataSize, currentPosition + (uint64_t) nameSize + 1, processedTagSize)) {
+                        // type byte + two name size bytes = 3
+                        if (!validateRawNBTData(data, dataSize, currentPosition + (uint64_t) nameSize + 3, processedTagSize)) {
                             delete processedTagSize;
                             return false;
                         }
-                        *processedTagSize += (uint64_t) nameSize + 1;
+                        *processedTagSize += (uint64_t) nameSize + 3;
                     }
                     currentPosition += *processedTagSize;
 
@@ -758,6 +759,7 @@ namespace NBT {
 
             // recursion abort condition
             if (data[currentPosition]==TagType::END) {
+                currentPosition++;
                 return true;
             }