diff --git a/python/src/jungfrau_data_file.hpp b/python/src/jungfrau_data_file.hpp
index 13a3202..942f6a6 100644
--- a/python/src/jungfrau_data_file.hpp
+++ b/python/src/jungfrau_data_file.hpp
@@ -20,14 +20,11 @@ using namespace ::aare;
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 
 auto read_dat_frame(JungfrauDataFile &self) {
-    std::vector<ssize_t> shape;
-    shape.reserve(2);
-    shape.push_back(self.rows());
-    shape.push_back(self.cols());
-
-    // return headers from all subfiles
     py::array_t<JungfrauDataHeader> header(1);
-    py::array_t<uint16_t> image(shape);
+    py::array_t<uint16_t> image({
+        self.rows(), 
+        self.cols() 
+    });
 
     self.read_into(reinterpret_cast<std::byte *>(image.mutable_data()),
                    header.mutable_data());
@@ -41,12 +38,11 @@ auto read_n_dat_frames(JungfrauDataFile &self, size_t n_frames) {
     if (n_frames == 0) {
         throw std::runtime_error("No frames left in file");
     }
-    std::vector<size_t> shape{n_frames, self.rows(), self.cols()};
 
-    // return headers from all subfiles
     py::array_t<JungfrauDataHeader> header(n_frames);
-
-    py::array_t<uint16_t> image(shape);
+    py::array_t<uint16_t> image({
+        n_frames, self.rows(), 
+        self.cols()});
 
     self.read_into(reinterpret_cast<std::byte *>(image.mutable_data()),
                    n_frames, header.mutable_data());
diff --git a/python/tests/conftest.py b/python/tests/conftest.py
index 340f30b..5badf13 100644
--- a/python/tests/conftest.py
+++ b/python/tests/conftest.py
@@ -11,7 +11,7 @@ def pytest_addoption(parser):
 
 
 def pytest_configure(config):
-    config.addinivalue_line("markers", "files: mark test as needing image fiels to run")
+    config.addinivalue_line("markers", "files: mark test as needing image files to run")
 
 
 def pytest_collection_modifyitems(config, items):
diff --git a/src/JungfrauDataFile.test.cpp b/src/JungfrauDataFile.test.cpp
index db5464b..626a318 100644
--- a/src/JungfrauDataFile.test.cpp
+++ b/src/JungfrauDataFile.test.cpp
@@ -66,4 +66,29 @@ TEST_CASE("Seek in a JungfrauDataFile", "[.files]"){
     REQUIRE(f.read_header().framenum == 60+1);
 
     REQUIRE_THROWS(f.seek(86356)); //out of range
+}
+
+TEST_CASE("Open a Jungfrau data file with non zero file index", "[.files]"){
+
+    auto fpath = test_data_path() / "dat" / "AldoJF65k_000003.dat";
+    REQUIRE(std::filesystem::exists(fpath));
+
+    JungfrauDataFile f(fpath);
+
+    //18 files per data file, opening the 3rd file we ignore the first 3
+    REQUIRE(f.total_frames() == 113-18*3);
+    REQUIRE(f.tell() == 0);
+
+    //Frame numbers start at 1 in the first file
+    REQUIRE(f.read_header().framenum == 18*3+1);
+
+    // moving relative to the third file
+    f.seek(5);
+    REQUIRE(f.read_header().framenum == 18*3+1+5);
+
+    // ignoring the first 3 files
+    REQUIRE(f.n_files() == 4);
+
+    REQUIRE(f.current_file().stem() == "AldoJF65k_000003");
+
 }
\ No newline at end of file