diff --git a/src/ifcpatch/ifcpatch/recipes/MergeProjects.py b/src/ifcpatch/ifcpatch/recipes/MergeProjects.py
index 3dd993f144..372cb039a3 100644
--- a/src/ifcpatch/ifcpatch/recipes/MergeProjects.py
+++ b/src/ifcpatch/ifcpatch/recipes/MergeProjects.py
@@ -57,6 +57,14 @@ class Patcher:
         self.filepaths = filepaths
 
     def patch(self):
+        if isinstance(self.filepaths, Union[str, ifcopenshell.file]):
+            print(
+                (
+                    "WARNING. Passing a single file/filepath will be deprecated soon for MergeProjects ifcpatch, "
+                    "replace it with a list of file/filepaths."
+                )
+            )
+            self.filepaths = [self.filepaths]
         for filepath in self.filepaths:
             if isinstance(filepath, ifcopenshell.file):
                 other = filepath