diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 4106d0a..939d02e 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -428,6 +428,14 @@ std::string Buffer::ReadData(unsigned int bytes) {
 }
 
 void Buffer::WriteData(const char* str, unsigned int len) {
+	if(len != 0) {
+		unsigned int p = length;
+		SetLength(length + len);
+		memcpy(data + p, str, len);
+	}
+}
+
+void Buffer::WriteDataGML(const char* str, unsigned int len) {
 	if(len != 0) {
 		if (pos + len > length) {
 			SetLength(pos + len);
diff --git a/src/Buffer.h b/src/Buffer.h
index c88e125..eda2d99 100644
--- a/src/Buffer.h
+++ b/src/Buffer.h
@@ -62,6 +62,7 @@ class Buffer {
 	void WriteString(const char* str);
 	std::string ReadData(unsigned int bytes);
 	void WriteData(const char* str, unsigned int len);
+	void WriteDataGML(const char* str, unsigned int len);
 	std::string ReadHex(unsigned int bytes);
 	void WriteHex(const char* str, unsigned int len);
 	std::string ReadBase64(unsigned int bytes);
diff --git a/src/gm_buffer.cpp b/src/gm_buffer.cpp
index b6a1e3e..fb6a9f1 100644
--- a/src/gm_buffer.cpp
+++ b/src/gm_buffer.cpp
@@ -341,7 +341,7 @@ gmexport const char* buffer_read_data(double id, double len) {
 gmexport double buffer_write_data(double id, const char* string) {
 	Buffer *b = gmdata.FindBuffer(gm_cast<unsigned int>(id));
 	if(b == NULL) return 0;
-	b->WriteData(string, strlen(string));
+	b->WriteDataGML(string, strlen(string));
 	return 1;
 }