diff --git a/src/bioregistry/data/bioregistry.json b/src/bioregistry/data/bioregistry.json
index 580421bdf..d0ff8b0bd 100644
--- a/src/bioregistry/data/bioregistry.json
+++ b/src/bioregistry/data/bioregistry.json
@@ -14900,6 +14900,7 @@
       "clinicaltrial",
       "ctgov"
     ],
+    "uri_format": "https://www.clinicaltrials.gov/study/$1",
     "wikidata": {
       "database": "Q5133746",
       "description": "identifier in the ClinicalTrials.gov database",