diff --git a/include/qemu-io.h b/include/qemu-io.h
index 7e7c07c..5d6006f 100644
--- a/include/qemu-io.h
+++ b/include/qemu-io.h
@@ -38,6 +38,8 @@
     helpfunc_t  help;
 } cmdinfo_t;
 
+extern bool qemuio_misalign;
+
 bool qemuio_command(BlockDriverState *bs, const char *cmd);
 
 void qemuio_add_command(const cmdinfo_t *ci);