diff --git a/include/ion/ion.h b/include/ion/ion.h
index 879eab3..cafead5 100644
--- a/include/ion/ion.h
+++ b/include/ion/ion.h
@@ -18,8 +18,13 @@
  *  limitations under the License.
  */
 
+#ifndef __SYS_CORE_ION_H
+#define __SYS_CORE_ION_H
+
 #include <linux/ion.h>
 
+__BEGIN_DECLS
+
 int ion_open();
 int ion_close(int fd);
 int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
@@ -30,3 +35,6 @@
 int ion_share(int fd, struct ion_handle *handle, int *share_fd);
 int ion_import(int fd, int share_fd, struct ion_handle **handle);
 
+__END_DECLS
+
+#endif /* __SYS_CORE_ION_H */