diff --git a/esmvalcore/_recipe/recipe.py b/esmvalcore/_recipe/recipe.py
index 1613f6cf6d..d245880fa0 100644
--- a/esmvalcore/_recipe/recipe.py
+++ b/esmvalcore/_recipe/recipe.py
@@ -250,25 +250,42 @@ def _add_to_download_list(dataset):
 
 
 def _schedule_for_download(datasets):
-    """Schedule files for download and show the list of files in the log."""
+    """Schedule files for download."""
     for dataset in datasets:
         _add_to_download_list(dataset)
         for supplementary_ds in dataset.supplementaries:
             _add_to_download_list(supplementary_ds)
 
-        files = list(dataset.files)
-        for supplementary_ds in dataset.supplementaries:
-            files.extend(supplementary_ds.files)
+
+def _log_input_files(datasets: Iterable[Dataset]) -> None:
+    """Show list of files in log (including supplementaries)."""
+    for dataset in datasets:
+        # Only log supplementary variables if present
+        supplementary_files_str = ""
+        if dataset.supplementaries:
+            for sup_ds in dataset.supplementaries:
+                supplementary_files_str += (
+                    f"\nwith files for supplementary variable "
+                    f"{sup_ds['short_name']}:\n{_get_files_str(sup_ds)}"
+                )
 
         logger.debug(
-            "Using input files for variable %s of dataset %s:\n%s",
+            "Using input files for variable %s of dataset %s:\n%s%s",
             dataset.facets['short_name'],
-            dataset.facets['alias'].replace('_', ' '),
-            '\n'.join(f'{f} (will be downloaded)' if not f.exists() else str(f)
-                      for f in files),
+            dataset.facets['alias'].replace('_', ' '),  # type: ignore
+            _get_files_str(dataset),
+            supplementary_files_str
         )
 
 
+def _get_files_str(dataset: Dataset) -> str:
+    """Get nice string representation of all files of a dataset."""
+    return '\n'.join(
+        f'  {f}' if f.exists()  # type: ignore
+        else f'  {f} (will be downloaded)' for f in dataset.files
+    )
+
+
 def _check_input_files(input_datasets: Iterable[Dataset]) -> set[str]:
     """Check that the required input files are available."""
     missing = set()
@@ -517,6 +534,7 @@ def _get_preprocessor_products(
         _set_version(dataset, input_datasets)
         USED_DATASETS.append(dataset)
         _schedule_for_download(input_datasets)
+        _log_input_files(input_datasets)
         logger.info("Found input files for %s", dataset.summary(shorten=True))
 
         filename = _get_output_file(