diff --git a/include/exiv2/quicktimevideo.hpp b/include/exiv2/quicktimevideo.hpp
index 3050aaf6..9a8b1d47 100644
--- a/include/exiv2/quicktimevideo.hpp
+++ b/include/exiv2/quicktimevideo.hpp
@@ -223,7 +223,7 @@ namespace Exiv2 {
 
     private:
         //! Variable which stores Time Scale unit, used to calculate time.
-        uint64_t timeScale_ = 1;
+        uint64_t timeScale_;
         //! Variable which stores current stream being processsed.
         int currentStream_;
         //! Variable to check the end of metadata traversing.
diff --git a/src/quicktimevideo.cpp b/src/quicktimevideo.cpp
index e7ca8c25..be27da54 100644
--- a/src/quicktimevideo.cpp
+++ b/src/quicktimevideo.cpp
@@ -610,6 +610,7 @@ namespace Exiv2 {
 
     QuickTimeVideo::QuickTimeVideo(BasicIo::AutoPtr io)
             : Image(ImageType::qtime, mdNone, io)
+            , timeScale_(1)
     {
     } // QuickTimeVideo::QuickTimeVideo