diff --git a/src/sourceterms/sn_feedback/sn_feedback_struct.h b/src/sourceterms/sn_feedback/sn_feedback_struct.h
index 2b4dbe97b0a687cc48d0ba7e12b105f306cb7e96..dd1842a6717c6c5a20352324cbe6b018c73e7b3e 100644
--- a/src/sourceterms/sn_feedback/sn_feedback_struct.h
+++ b/src/sourceterms/sn_feedback/sn_feedback_struct.h
@@ -42,4 +42,4 @@ struct supernova_struct {
   double x, y, z;
   enum supernova_status status;
 };
-#endif SWIFT_SN_FEEDBACK_STRUCT_H
+#endif /* SWIFT_SN_FEEDBACK_STRUCT_H */