diff --git a/test_problems/shared/fileLog.h b/test_problems/shared/fileLog.h
index f7cd9c4d9..fda515d2f 100644
--- a/test_problems/shared/fileLog.h
+++ b/test_problems/shared/fileLog.h
@@ -7,11 +7,15 @@ class fileLog: public Cantera::Logger
 public:
     explicit fileLog(const std::string& fName) {
         m_fName = fName;
-        m_fs.open(fName.c_str());
+        m_fs.open(fName.c_str(), std::ios::out);
     }
 
     virtual void write(const std::string& msg) {
-        m_fs << msg << std::endl;
+        m_fs << msg;
+    }
+
+    virtual void writeendl() {
+        m_fs << std::endl;
     }
 
     virtual ~fileLog() {