diff --git a/hw/ppc/spapr_ovec.c b/hw/ppc/spapr_ovec.c
index 3eb1d59..0bcf311 100644
--- a/hw/ppc/spapr_ovec.c
+++ b/hw/ppc/spapr_ovec.c
@@ -250,5 +250,5 @@
         }
     }
 
-    return fdt_setprop(fdt, fdt_offset, name, vec, vec_len);
+    return fdt_setprop(fdt, fdt_offset, name, vec, vec_len + 1);
 }