diff --git a/runtime/syntax/jsonnet.yaml b/runtime/syntax/jsonnet.yaml
index a278b505..928b78dc 100644
--- a/runtime/syntax/jsonnet.yaml
+++ b/runtime/syntax/jsonnet.yaml
@@ -1,4 +1,4 @@
-filename: jsonnet
+filetype: jsonnet
 
 detect:
     filename: "\\.jsonnet$"