diff --git a/storm/big/BigBuffer.cpp b/storm/big/BigBuffer.cpp
index 71200fb..31969ec 100644
--- a/storm/big/BigBuffer.cpp
+++ b/storm/big/BigBuffer.cpp
@@ -33,6 +33,14 @@ void BigBuffer::SetCount(uint32_t count) {
     this->m_data.SetCount(this->m_offset + count);
 }
 
+void BigBuffer::SetOffset(uint32_t offset) {
+    this->m_offset = offset;
+
+    if (offset) {
+        this->GrowToFit(0xFFFFFFFF);
+    }
+}
+
 void BigBuffer::Trim() const {
     while (this->Count()) {
         auto& data = const_cast<TSGrowableArray<uint32_t>&>(this->m_data);
diff --git a/storm/big/BigBuffer.hpp b/storm/big/BigBuffer.hpp
index fac408d..7170b36 100644
--- a/storm/big/BigBuffer.hpp
+++ b/storm/big/BigBuffer.hpp
@@ -18,6 +18,7 @@ class BigBuffer {
     void GrowToFit(uint32_t index);
     int32_t IsUsed(uint32_t index) const;
     void SetCount(uint32_t count);
+    void SetOffset(uint32_t offset);
     void Trim() const;
 };