diff --git a/api/savedata/update.go b/api/savedata/update.go
index efd1785..a1c2c65 100644
--- a/api/savedata/update.go
+++ b/api/savedata/update.go
@@ -96,7 +96,7 @@ func ProcessSessionMetrics(save defs.SessionSaveData, username string) {
 
 			formIndex := ""
 			if formIdx, ok := partyMember["formIndex"].(float64); ok && formIdx != 0 {
-				formIndex = fmt.Sprintf("%d", int(formIdx))
+				formIndex = fmt.Sprintf("-%d", int(formIdx))
 			}
 
 			speciesFloat, ok := partyMember["species"].(float64)
@@ -106,7 +106,7 @@ func ProcessSessionMetrics(save defs.SessionSaveData, username string) {
 			}
 			species := int(speciesFloat)
 
-			key := fmt.Sprintf("%d-%s", species, formIndex)
+			key := fmt.Sprintf("%d%s", species, formIndex)
 			party += key + ","
 			starterCounter.WithLabelValues(key).Inc()
 		}