diff --git a/src/src/view/dicomimageview.cpp b/src/src/view/dicomimageview.cpp
index 9807daf..d230818 100644
--- a/src/src/view/dicomimageview.cpp
+++ b/src/src/view/dicomimageview.cpp
@@ -762,7 +762,7 @@ void DicomImageView::onPreviousFrame()
 {
     if (HasSeries()) {
         int slice = _ImageViewer->GetSlice();
-        slice = slice--;
+        slice = --slice;
         int min_slice = _ImageViewer->GetSliceMin();
         if (slice < min_slice)
         {
@@ -776,7 +776,7 @@ void DicomImageView::onNextFrame()
 {
     if (HasSeries()) {
         int slice = _ImageViewer->GetSlice();
-        slice = slice++;
+        slice = ++slice;
         int max_slice = _ImageViewer->GetSliceMax();
         if (slice > max_slice)
         {