diff --git a/gracedb/models.py b/gracedb/models.py
index 21ee7987aaa57c0126ae070f68d6e56b60272a07..9f8c73b24fd4ab3a8bf4248f5762367df2aa2b91 100644
--- a/gracedb/models.py
+++ b/gracedb/models.py
@@ -143,7 +143,7 @@ class Event(models.Model):
             return "T%04d" % self.id
         elif str(self.search) == str("MDC"):
             return "M%04d" % self.id
-        elif self.pipeline == "HardwareInjection":
+        elif self.pipeline.name == "HardwareInjection":
             return "H%04d" % self.id
         elif self.group.name == "External":
             return "E%04d" % self.id