diff --git a/backend/pashub_fetcher/tests/test_core_files.py b/backend/pashub_fetcher/tests/test_core_files.py
index 5ac6b4f7..f968a976 100644
--- a/backend/pashub_fetcher/tests/test_core_files.py
+++ b/backend/pashub_fetcher/tests/test_core_files.py
@@ -88,6 +88,17 @@ def test_infer_retrofit_design_doc():
 # ---------------------------------------------------------------------------
 
 
+def test_core_file_for_evidence_category_match_is_case_insensitive() -> None:
+    # Arrange
+    filename = "2512-OSM-H21M900-XX-DR-N-A_Lord Nelson Street 018.pdf"
+
+    # Act
+    result = core_file_for(filename, evidence_category="Retrofit Design")
+
+    # Assert
+    assert result == CoreFiles.RETROFIT_DESIGN_DOC
+
+
 def test_core_file_for_evidence_category_returns_retrofit_design_doc() -> None:
     # Arrange
     filename = "2512-OSM-H21M900-XX-DR-N-A_Lord Nelson Street 018.pdf"