diff --git a/opensearch/client.go b/opensearch/client.go
index 20d7b3a..3633afa 100644
--- a/opensearch/client.go
+++ b/opensearch/client.go
@@ -158,7 +158,7 @@ func NewClient(cfg Config) (Client, error) {
 	}
 
 	indexPrefix := cfg.IndexPrefix
-	if !strings.HasSuffix(indexPrefix, "-") {
+	if !strings.HasSuffix(indexPrefix, "-") && len(indexPrefix) > 0 {
 		indexPrefix += "-"
 	}
 	if !strings.HasSuffix(indexPrefix, "ds-logs-") {