diff --git a/gsmL1prim.h b/gsmL1prim.h
index f33b2e06..4da27a65 100644
--- a/gsmL1prim.h
+++ b/gsmL1prim.h
@@ -408,3 +408,5 @@ struct GsmL1_PhRaInd_t phRaInd;
 
 enum GsmL1_PrimId_t id;
 } GsmL1_Prim_t;
+
+#endif