diff --git a/include/grpc/support/cpu.h b/include/grpc/support/cpu.h
index 863d5d2a224d6ae9f60d63c5a6a10fea20532e2a..db4bdd42aabbacb717797f1fb15c6c5c06ddfa60 100644
--- a/include/grpc/support/cpu.h
+++ b/include/grpc/support/cpu.h
@@ -34,6 +34,8 @@
 #ifndef GRPC_SUPPORT_CPU_H
 #define GRPC_SUPPORT_CPU_H
 
+#include <grpc/support/port_platform.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/include/grpc/support/subprocess.h b/include/grpc/support/subprocess.h
index 2ccdfccc08c19fd009d32e4a088d30aaf0611f98..ffbdf67357712fb6b2b16dd870ddbc5a14046a5f 100644
--- a/include/grpc/support/subprocess.h
+++ b/include/grpc/support/subprocess.h
@@ -34,6 +34,8 @@
 #ifndef GRPC_SUPPORT_SUBPROCESS_H
 #define GRPC_SUPPORT_SUBPROCESS_H
 
+#include <grpc/support/port_platform.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif