diff --git a/pygbif/caching.py b/pygbif/caching.py
index 43ef2f7..50b2b4d 100644
--- a/pygbif/caching.py
+++ b/pygbif/caching.py
@@ -83,7 +83,7 @@ def caching(
         requests_cache.install_cache(
             cache_name=CACHE_NAME, backend=backend, expire_after=expire_after
         )
-        requests_cache.delete(expired=True)()
+        requests_cache.delete(expired=True)
 
     cache_settings = {
         "cache": cache,
@@ -93,4 +93,4 @@ def caching(
         "allowable_codes": allowable_codes,
         "allowable_methods": allowable_methods,
     }
-    return cache_settings
\ No newline at end of file
+    return cache_settings