diff --git a/nixfig.go b/nixfig.go
index d89e98b..b4ec108 100644
--- a/nixfig.go
+++ b/nixfig.go
@@ -31,7 +31,7 @@ func init() {
 			break
 		}
 	}
-	if envPath, ok := os.LookupEnv("NIXFIG_FMT"); ok {
+	if envPath, ok := os.LookupEnv("NIXFIG_FMT"); ok && envPath != "" {
 		Fmt = strings.Split(envPath, " ")
 	}
 }