diff --git a/src/convert.cpp b/src/convert.cpp
index 85e16654..48ffeec8 100644
--- a/src/convert.cpp
+++ b/src/convert.cpp
@@ -591,7 +591,7 @@ namespace Exiv2 {
             double dhour = pos->toFloat(0);
             double dmin = pos->toFloat(1);
             // Hack: Need Value::toDouble
-            URational r = pos->toRational(2);
+            Rational r = pos->toRational(2);
             double dsec = static_cast<double>(r.first)/r.second;
 
             if (!pos->value().ok()) {
diff --git a/src/crwimage.cpp b/src/crwimage.cpp
index c5ec84f0..0e181a2f 100644
--- a/src/crwimage.cpp
+++ b/src/crwimage.cpp
@@ -1035,7 +1035,8 @@ namespace Exiv2 {
         if (ifdId == canonSiId) {
             // Exif.Photo.FNumber
             float f = fnumber(canonEv(aperture));
-            URational ur = floatToRationalCast(f);
+            Rational r = floatToRationalCast(f);
+            URational ur(r.first, r.second);
             URationalValue fn;
             fn.value_.push_back(ur);
             image.exifData().add(ExifKey("Exif.Photo.FNumber"), &fn);