diff --git a/run.py b/run.py
index a0eccd3c1279dce79b2c6746b041117ba5754e37..c1f38505bc429bd3f835bc04330fd6e1389eecd1 100755
--- a/run.py
+++ b/run.py
@@ -176,7 +176,7 @@ class AptSource:
         line,       # type: str
     ):
         # type: (...) -> AptSource
-        signed_by: typing.List[str] = []
+        signed_by: typing.List[SignedBy] = []
         rest: typing.List[str] = []
         tokens = line.split()
         trusted = False