1 files changed, 4 insertions, 0 deletions
diff --git a/src/iso.h b/src/iso.h
index 674352b1..38d96847 100644
--- a/src/iso.h
+++ b/src/iso.h
@@ -19,6 +19,9 @@
     Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
  */
+
+#ifndef _ISO_H
+#define _ISO_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -38,3 +41,4 @@ int recover_ISO(const struct iso_primary_descriptor *iso, partition_t *partition
 #ifdef __cplusplus
 } /* closing brace for extern "C" */
 #endif
+#endif