diff --git a/src/runtime/c/pgf/ipc.h b/src/runtime/c/pgf/ipc.h
index 2803419cf..70fe37b6b 100644
--- a/src/runtime/c/pgf/ipc.h
+++ b/src/runtime/c/pgf/ipc.h
@@ -4,7 +4,7 @@
 PGF_INTERNAL_DECL
 pthread_rwlock_t *ipc_new_file_rwlock(const char* file_path);
 
-PGF_INTERNAL
+PGF_INTERNAL_DECL
 void ipc_release_file_rwlock(const char* file_path,
                              pthread_rwlock_t *rwlock);