diff --git a/Framework/API/inc/MantidAPI/FileFinder.h b/Framework/API/inc/MantidAPI/FileFinder.h
index 7ec66acdb8d08b49d031187b2801b24715f22063..1c5bb1f8f4dd2895b3e3364fcf1fc4c27ab6b490 100644
--- a/Framework/API/inc/MantidAPI/FileFinder.h
+++ b/Framework/API/inc/MantidAPI/FileFinder.h
@@ -48,14 +48,12 @@ public:
   bool getCaseSensitive() const;
   std::vector<IArchiveSearch_sptr>
   getArchiveSearch(const Kernel::FacilityInfo &facility) const;
-  std::string
-  findRun(const std::string &hintstr,
-          const std::vector<std::string> &exts = std::vector<std::string>(),
-          const bool useExtsOnly = false) const;
-  std::vector<std::string>
-  findRuns(const std::string &hintstr,
-           const std::vector<std::string> &exts = std::vector<std::string>(),
-           const bool useExtsOnly = false) const;
+  std::string findRun(const std::string &hintstr,
+                      const std::vector<std::string> &exts,
+                      const bool useExtsOnly = false) const;
+  std::vector<std::string> findRuns(const std::string &hintstr,
+                                    const std::vector<std::string> &exts = {},
+                                    const bool useExtsOnly = false) const;
   /// DO NOT USE! MADE PUBLIC FOR TESTING ONLY.
   const Kernel::InstrumentInfo getInstrument(const std::string &hint) const;
   /// DO NOT USE! MADE PUBLIC FOR TESTING ONLY.