diff --git a/src/StreamEpics.cc b/src/StreamEpics.cc
index c1eadd6..6e41726 100644
--- a/src/StreamEpics.cc
+++ b/src/StreamEpics.cc
@@ -965,13 +965,13 @@ getFieldAddress(const char* fieldname, StreamBuffer& address)
     else
     {
         // FIELD in this record or VAL in other record
-        char fullname[PVNAME_SZ + 1];
-        sprintf(fullname, "%s.%s", name(), fieldname);
-        if (dbNameToAddr(fullname, &dbaddr) != OK)
+        StreamBuffer fullname;
+        fullname.print("%s.%s", name(), fieldname);
+        if (dbNameToAddr(fullname(), &dbaddr) != OK)
         {
             // VAL in other record
-            sprintf(fullname, "%s.VAL", fieldname);
-            if (dbNameToAddr(fullname, &dbaddr) != OK) return false;
+            fullname.clear().print("%s.VAL", fieldname);
+            if (dbNameToAddr(fullname(), &dbaddr) != OK) return false;
         }
     }
     address.append(&dbaddr, sizeof(dbaddr));