diff --git a/src/reports/data/sonata_data.cpp b/src/reports/data/sonata_data.cpp
index 28ff2479..b43d634a 100644
--- a/src/reports/data/sonata_data.cpp
+++ b/src/reports/data/sonata_data.cpp
@@ -23,7 +23,7 @@ SonataData::SonataData(const std::string& report_name,
     , hdf5_writer_(std::make_unique<HDF5Writer>(report_name))
     , nodes_(nodes) {
     prepare_buffer(max_buffer_size);
-    index_pointers_.resize(nodes->size());
+    index_pointers_.resize(nodes->size() + 1);
     time_ = {tstart, tend, dt};
 
     reporting_period_ = static_cast<int>(dt / SonataReport::atomic_step_);
diff --git a/src/reports/io/hdf5_writer.cpp b/src/reports/io/hdf5_writer.cpp
index 3d00fe70..c8fc573e 100644
--- a/src/reports/io/hdf5_writer.cpp
+++ b/src/reports/io/hdf5_writer.cpp
@@ -173,7 +173,7 @@ void HDF5Writer::write_time(const std::string& dataset_name, const std::array<do
 }
 
 void HDF5Writer::close() {
-    // We close the dataset "/data", the spikes enum type and the hdf5 file
+    // We close the dataset "/data", the spike enum type and the hdf5 file
     if (dataset_) {
         H5Dclose(dataset_);
         dataset_ = 0;
diff --git a/tests/reports/unit/test_sonatadata.cpp b/tests/reports/unit/test_sonatadata.cpp
index 0bc5e97e..69a41b68 100644
--- a/tests/reports/unit/test_sonatadata.cpp
+++ b/tests/reports/unit/test_sonatadata.cpp
@@ -80,7 +80,7 @@ SCENARIO("Test SonataData class", "[SonataData][IOWriter]") {
 
             THEN("We check the index pointers of the sonata report") {
                 const std::vector<uint64_t> index_pointers = sonata->get_index_pointers();
-                std::vector<uint64_t> compare = {0, 2, 5};
+                std::vector<uint64_t> compare = {0, 2, 5, 11};
                 REQUIRE(index_pointers == compare);
             }
         }