diff --git a/libguestfs-inspect.h b/libguestfs-inspect.h
index 3eebd2e..d052c27 100644
--- a/libguestfs-inspect.h
+++ b/libguestfs-inspect.h
@@ -1,3 +1,6 @@
+#ifndef LIBGUESTFS_INSPECT_H
+#define LIBGUESTFS_INSPECT_H
+
 #include <czmq.h>
 
 enum guestfs_inspect_command_const {
@@ -131,3 +134,5 @@ static void command_destroy(struct guestfs_inpsect_command **c) {
   free(*c);
   *c = NULL;
 }
+
+#endif // LIBGUESTFS_INSPECT_H