diff --git a/pql/ast.go b/pql/ast.go
index 1d6442db9..00572e821 100644
--- a/pql/ast.go
+++ b/pql/ast.go
@@ -435,6 +435,7 @@ var callInfoByFunc = map[string]callInfo{
 			"_field": "",
 			"field":  "",
 		},
+	},
 	"Percentile": {
 		allowUnknown: false,
 		prototypes: map[string]interface{}{