diff --git a/tools/schemacode/bidsschematools/rules.py b/tools/schemacode/bidsschematools/rules.py
index dd5353a0b5..37592618a7 100644
--- a/tools/schemacode/bidsschematools/rules.py
+++ b/tools/schemacode/bidsschematools/rules.py
@@ -124,7 +124,7 @@ def _entity_rule(rule: Mapping, schema: bst.types.Namespace):
     ext_regex = f"(?P<extension>{ext_match})"
 
     return {
-        "regex": "".join(dir_regex + entity_regex + [suffix_regex, ext_regex]),
+        "regex": "".join(dir_regex + entity_regex + [suffix_regex, ext_regex, "$"]),
         "mandatory": False,
     }