diff --git a/src/modules/rlm_cache/serialize.c b/src/modules/rlm_cache/serialize.c
index 66f2b970a471..c941b4246503 100644
--- a/src/modules/rlm_cache/serialize.c
+++ b/src/modules/rlm_cache/serialize.c
@@ -168,8 +168,7 @@ int cache_deserialize(rlm_cache_entry_t *c, char *in, ssize_t inlen)
 		}
 
 		/*
-		 *	Convert literal to a type appropriate for
-		 *	the VP.
+		 *	Convert literal to a type appropriate for the VP.
 		 */
 		if (tmpl_cast_in_place(map->rhs, map->lhs->tmpl_da->type, map->lhs->tmpl_da) < 0) goto error;
 
@@ -177,6 +176,7 @@ int cache_deserialize(rlm_cache_entry_t *c, char *in, ssize_t inlen)
 		len = value_data_copy(vp, &vp->data, map->rhs->tmpl_data_type,
 				      &map->rhs->tmpl_data_value, map->rhs->tmpl_data_length);
 		if (len < 0) goto error;
+		vp->vp_length = len;
 
 		/*
 		 *	Pull out the special attributes, and set the