diff --git a/src/applications/repository/conduit/ConduitAPI_repository_create_Method.php b/src/applications/repository/conduit/ConduitAPI_repository_create_Method.php
index 7fba83c15d..cb6237bbd1 100644
--- a/src/applications/repository/conduit/ConduitAPI_repository_create_Method.php
+++ b/src/applications/repository/conduit/ConduitAPI_repository_create_Method.php
@@ -83,7 +83,7 @@ final class ConduitAPI_repository_create_Method
     $repository->setName($request->getValue('name'));
 
     $callsign = $request->getValue('callsign');
-    if (!preg_match('/[A-Z]+$/', $callsign)) {
+    if (!preg_match('/^[A-Z]+$/', $callsign)) {
       throw new ConduitException('ERR-BAD-CALLSIGN');
     }
     $repository->setCallsign($callsign);