diff --git a/include/lima/io/h5/writer.hpp b/include/lima/io/h5/writer.hpp
index 619dc1ef2a2d5ffe94ebdbfa7ea2d1dbb1275db5..3acb750df42912b705b05648bd3c6d5a0a4f66cb 100644
--- a/include/lima/io/h5/writer.hpp
+++ b/include/lima/io/h5/writer.hpp
@@ -604,7 +604,8 @@ namespace io
 
             void write_frame_idx(hsize_t frame_idx, unsigned int val)
             {
-                if (frame_idx >= m_nb_frames)
+                // The dimension of the frame_idx dataset is (nb_frames + 1)
+                if (frame_idx > m_nb_frames)
                     LIMA_THROW_EXCEPTION(lima::hdf5_error("Frame number out of bound")
                                          << boost::errinfo_frame_idx(frame_idx));