diff --git a/src/cljc/auto_ap/ledger/reports.cljc b/src/cljc/auto_ap/ledger/reports.cljc
index 3a0ea348..eccde6c0 100644
--- a/src/cljc/auto_ap/ledger/reports.cljc
+++ b/src/cljc/auto_ap/ledger/reports.cljc
@@ -275,7 +275,7 @@
             (map 
               (fn [account]
                 (if (types (best-category account))
-                  (update account :amount -)
+                  (update account :amount #(- (or % 0.0)))
                   account))
               accounts))))