1 files changed, 3 insertions, 0 deletions
diff --git a/src/thfs.h b/src/thfs.h
index a62e675b..8b0fc476 100644
--- a/src/thfs.h
+++ b/src/thfs.h
@@ -19,6 +19,8 @@
     Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
  */
+#ifndef _THFS_H
+#define _THFS_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -28,3 +30,4 @@ int HFS_HFSP_boot_sector(disk_t *disk_car, partition_t *partition, const int ver
 #ifdef __cplusplus
 } /* closing brace for extern "C" */
 #endif
+#endif