diff --git a/cmd/http/router.go b/cmd/http/router.go
index 0828f5b..02b81f0 100644
--- a/cmd/http/router.go
+++ b/cmd/http/router.go
@@ -138,7 +138,12 @@ func (router Router) APITransactions(w http.ResponseWriter, r *http.Request) {
 				biggest = v
 			}
 		}
-		for k, v := range normalized {
+		ks := []string{}
+		for k := range normalized {
+			ks = append(ks, k)
+		}
+		for _, k := range ks {
+			v := normalized[k]
 			if v := math.Abs(v["$"]); v < biggest {
 				normalizedDelta := biggest - v
 				normalizedFactor := normalizer.NormalizeFactor(ledger.Delta{Name: k, Date: time.Now().Format("2006-01-02")})