diff --git a/src/pdr.c b/src/pdr.c
index 6fb5518..cd7857a 100644
--- a/src/pdr.c
+++ b/src/pdr.c
@@ -79,8 +79,8 @@
 	}
 	record->next = NULL;
 
+	assert(!repo->first == !repo->last);
 	if (repo->first == NULL) {
-		assert(repo->last == NULL);
 		repo->first = record;
 		repo->last = record;
 	} else {