diff --git a/projects/protobuf-c/project.yaml b/projects/protobuf-c/project.yaml
index 273946e93..a2a90f2af 100644
--- a/projects/protobuf-c/project.yaml
+++ b/projects/protobuf-c/project.yaml
@@ -1,4 +1,5 @@
 homepage: "https://github.com/protobuf-c/protobuf-c"
+language: c
 primary_contact: "guidovranken@gmail.com"
 sanitizers:
  - address