diff --git a/updatecoll.py b/updatecoll.py
index b45f7d1..a9dd6cf 100644
--- a/updatecoll.py
+++ b/updatecoll.py
@@ -13,6 +13,12 @@ except:
     print()
     sys.exit()
 
+if apiconfig.mediafolder[-1] != "/":
+    print("Error!")
+    print("  mediafolder value in apiconfig.py does not have a trailing slash")
+    print()
+    sys.exit()
+
 colcontents = {}
 for col in apiconfig.colmap.values():
     colcontents[col] = []