diff --git a/tempfile/TempFile.h b/tempfile/TempFile.h
index e5a93380..01288215 100644
--- a/tempfile/TempFile.h
+++ b/tempfile/TempFile.h
@@ -9,8 +9,8 @@ namespace cpputils {
 
 class TempFile {
 public:
-  TempFile(const boost::filesystem::path &path, bool create = true);
-  TempFile(bool create = true);
+  explicit TempFile(const boost::filesystem::path &path, bool create = true);
+  explicit TempFile(bool create = true);
   virtual ~TempFile();
   const boost::filesystem::path &path() const;