diff --git a/hw/ppc/spapr_ovec.c b/hw/ppc/spapr_ovec.c
index 3eb1d5976fc072e3461f96c2d67dd152cfb50a65..0bcf311f8b2bdb751e5c7e860aa7d042e5ed2a1a 100644
--- a/hw/ppc/spapr_ovec.c
+++ b/hw/ppc/spapr_ovec.c
@@ -250,5 +250,5 @@ int spapr_ovec_populate_dt(void *fdt, int fdt_offset,
         }
     }
 
-    return fdt_setprop(fdt, fdt_offset, name, vec, vec_len);
+    return fdt_setprop(fdt, fdt_offset, name, vec, vec_len + 1);
 }