diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index e879bee..6332d18 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -21,6 +21,8 @@ jobs:
         run: pip install sphinx sphinx_rtd_theme sphinx-autodoc-typehints myst-parser
       - name: Generate Class List
         run: |
+          echo "Create a dummy file to ensure the class list generation works"
+          printf 'gapy\x00\x00\x00\x00' > src/gaspype/data/therm_data.bin
           pip install .
           python ./docs/source/generate_class_list.py
       - name: Build Docs
diff --git a/src/gaspype/__init__.py b/src/gaspype/__init__.py
index 4e76e32..e5ff204 100644
--- a/src/gaspype/__init__.py
+++ b/src/gaspype/__init__.py
@@ -1002,10 +1002,9 @@ def carbon_activity(f: fluid | elements, t: float, p: float) -> float:
     return exp(lnalpha)
 
 
-_oxygen_data = fluid({'O2': 1})
-
-
 def oxygen_partial_pressure(f: fluid | elements, t: float, p: float) -> FloatArray | float:
+    _oxygen_data = fluid({'O2': 1})
+
     def get_oxygen(x: FloatArray) -> float:
         g_rt = f.fs.get_species_g_rt(t)
         g_rt_o2 = _oxygen_data.fs.get_species_g_rt(t)[0]
diff --git a/thermo_data/README.md b/thermo_data/README.md
index c8b0378..89df24b 100644
--- a/thermo_data/README.md
+++ b/thermo_data/README.md
@@ -31,7 +31,7 @@ General syntax is: ```python compile_to_bin.py YAML_INPUT_FILE BINARY_OUTPUT_FIL
 The binary format is structured like this, it uses little-endian and IEEE 754 floats:
 ```
 [4 Byte magic number: 'gapy']
-[8 Byte: 32 Bit integer for length of all species names (NAMES_LENGTH)]
+[4 Byte: 32 Bit integer for length of all species names (NAMES_LENGTH)]
 [NAMES_LENGTH Bytes: ASCII encoded string with all species names separated by space]
 [Index
     [For each species