diff --git a/gtsam/linear/Preconditioner.h b/gtsam/linear/Preconditioner.h
index 61df4414d..efcb28710 100644
--- a/gtsam/linear/Preconditioner.h
+++ b/gtsam/linear/Preconditioner.h
@@ -155,6 +155,10 @@ public:
   double* getBuffer() {
     return buffer_;
   }
+  size_t getBufferSize() {
+	return bufferSize_;
+  }
+
 protected:
 
   void clean() ;