diff --git a/pkgs/development/python-modules/pycdio/default.nix b/pkgs/development/python-modules/pycdio/default.nix
index e851ba916076..4449da9a848d 100644
--- a/pkgs/development/python-modules/pycdio/default.nix
+++ b/pkgs/development/python-modules/pycdio/default.nix
@@ -39,15 +39,18 @@ buildPythonPackage (finalAttrs: {
     libiconv
   ];
 
+  postPatch = ''
+    substituteInPlace {data,test}/isofs-m1.cue \
+      --replace-fail "ISOFS-M1.BIN" "isofs-m1.bin"
+  '';
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   enabledTestPaths = [ "test/test-*.py" ];
 
   disabledTests = [
     # Test are depending on image files that are not there
-    "test_fs"
     "test_bincue"
-    "test_read"
     "test_cdda"
   ];