Index: apps/pgp/filter.c
--- apps/pgp/filter.c.orig
+++ apps/pgp/filter.c
@@ -269,7 +269,7 @@ static Boolean keyValidityOK(struct RingSet *ringset,
     struct RingIterator *NameIter = NULL;
     union RingObject *name;
     Boolean OKToUse = FALSE, FoundName = FALSE;
-    int len = 0;
+    size_t len = 0;
     int trust;
     char *TempNameString = NULL;
 
