diff --git a/runtime/syntax/jsonnet.yaml b/runtime/syntax/jsonnet.yaml
index 928b78dc..45cb3e26 100644
--- a/runtime/syntax/jsonnet.yaml
+++ b/runtime/syntax/jsonnet.yaml
@@ -1,7 +1,7 @@
 filetype: jsonnet
 
 detect:
-    filename: "\\.jsonnet$"
+    filename: "\\.(jsonnet|libsonnet)$"
 
 # Spec: https://jsonnet.org/ref/spec.html