diff --git a/lib/galaxy/tools/__init__.py b/lib/galaxy/tools/__init__.py
index e7c52a1af0f8..37bfd36683ea 100644
--- a/lib/galaxy/tools/__init__.py
+++ b/lib/galaxy/tools/__init__.py
@@ -3772,7 +3772,7 @@ class DuplicateFileToCollectionTool(DatabaseOperationTool):
 
     def produce_outputs(self, trans, out_data, output_collections, incoming, history, **kwds):
         hda = incoming["input"]
-        number = incoming["number"]
+        number = int(incoming["number"])
         element_identifier = incoming["element_identifier"]
         elements = {
             f"{element_identifier} {n}": hda.copy(copy_tags=hda.tags, flush=False) for n in range(1, number + 1)