diff --git a/api/include/opentelemetry/context/propagation/composite_propagator.h b/api/include/opentelemetry/context/propagation/composite_propagator.h
index 85ad97b0fc..d7a6cbda17 100644
--- a/api/include/opentelemetry/context/propagation/composite_propagator.h
+++ b/api/include/opentelemetry/context/propagation/composite_propagator.h
@@ -1,6 +1,8 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+#pragma once
+
 #include <initializer_list>
 #include <memory>
 #include <vector>