diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 7ca175fa0..b68255c6e 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -186,7 +186,7 @@ jobs:
 
     - name: Add synthetic huge data
       if: steps.cache-data.outputs.cache-hit == 'true'
-      run: python -c "for n in range(7654321):print(f'{n:08x}')" >data/test.text
+      run: python -c "for n in range(7654321):print(f'{n:064x}')" >data/test.text
 
     - name: Update PIP
       run: python -m pip install --upgrade pip