diff --git a/gtsam_unstable/linear/QPSParser.cpp b/gtsam_unstable/linear/QPSParser.cpp
index 8bf81a111..331081126 100644
--- a/gtsam_unstable/linear/QPSParser.cpp
+++ b/gtsam_unstable/linear/QPSParser.cpp
@@ -129,6 +129,8 @@ struct QPSParser::MPSGrammar: base_grammar {
 
 QP QPSParser::Parse() {
   RawQP rawData;
+  std::fstream stream(fileName_.c_str());
+  stream.unsetf(std::ios::skipws);
   boost::spirit::basic_istream_iterator<char> begin(stream);
   boost::spirit::basic_istream_iterator<char> last;
 
diff --git a/gtsam_unstable/linear/QPSParser.h b/gtsam_unstable/linear/QPSParser.h
index 9cb795b3c..6e8b8164b 100644
--- a/gtsam_unstable/linear/QPSParser.h
+++ b/gtsam_unstable/linear/QPSParser.h
@@ -17,13 +17,12 @@ namespace gtsam {
 class QPSParser {
 
 private:
-  std::fstream stream;
+  std::string fileName_;
   struct MPSGrammar;
 public:
 
   QPSParser(const std::string& fileName) :
-      stream(findExampleDataFile(fileName).c_str()) {
-    stream.unsetf(std::ios::skipws);
+      fileName_(findExampleDataFile(fileName)) {
   }
 
   QP Parse();