diff --git a/MongoDB/src/Binary.cpp b/MongoDB/src/Binary.cpp
index 2cd18f81f..ea814d696 100644
--- a/MongoDB/src/Binary.cpp
+++ b/MongoDB/src/Binary.cpp
@@ -19,7 +19,7 @@ namespace Poco {
 namespace MongoDB {
 
 
-Binary::Binary(): 
+Binary::Binary():
 	_buffer(0),
 	_subtype(0)
 {
@@ -27,14 +27,14 @@ Binary::Binary():
 
 
 Binary::Binary(Poco::Int32 size, unsigned char subtype):
-	_buffer(size), 
+	_buffer(size),
 	_subtype(subtype)
 {
 }
 
 
 Binary::Binary(const UUID& uuid):
-	_buffer(128 / 8), 
+	_buffer(128 / 8),
 	_subtype(0x04)
 {
     unsigned char szUUID[16];
@@ -44,14 +44,14 @@ Binary::Binary(const UUID& uuid):
 
 
 
-Binary::Binary(const std::string& data, unsigned char subtype): 
+Binary::Binary(const std::string& data, unsigned char subtype):
 	_buffer(reinterpret_cast<const unsigned char*>(data.data()), data.size()),
 	_subtype(subtype)
 {
 }
 
-	
-Binary::Binary(const void* data, Poco::Int32 size, unsigned char subtype): 
+
+Binary::Binary(const void* data, Poco::Int32 size, unsigned char subtype):
 	_buffer(reinterpret_cast<const unsigned char*>(data), size),
 	_subtype(subtype)
 {
@@ -69,6 +69,7 @@ std::string Binary::toString(int indent) const
 	Base64Encoder encoder(oss);
 	MemoryInputStream mis((const char*) _buffer.begin(), _buffer.size());
 	StreamCopier::copyStream(mis, encoder);
+	encoder.close();
 	return oss.str();
 }