diff --git a/clj/db/pg.clj b/clj/db/pg.clj
index 4e2b9d2..0b6dfcd 100644
--- a/clj/db/pg.clj
+++ b/clj/db/pg.clj
@@ -284,10 +284,10 @@
                         params)]
         (dotimes [i n]
           (let [[oid p len fmt] (nth cells i)]
-            (ffi/write types   :uint    (* i os) oid)
-            (ffi/write values  :pointer (* i ps) p)
-            (ffi/write lengths :int     (* i is) len)
-            (ffi/write formats :int     (* i is) fmt)))
+            (ffi/write types :uint oid (* i os))
+            (ffi/write values :pointer p (* i ps))
+            (ffi/write lengths :int len (* i is))
+            (ffi/write formats :int fmt (* i is))))
         [types values lengths formats
          (into [types values lengths formats]
                (remove (fn [p] (ffi/null? p)) (mapv second cells)))]))))
diff --git a/deps.edn b/deps.edn
index ff15850..6e8a651 100644
--- a/deps.edn
+++ b/deps.edn
@@ -1,4 +1,9 @@
-{:paths ["clj"]
+{;; jolt.ffi/write takes the value BEFORE the offset as of jolt 0.8.0, and the
+ ;; two spellings are both integers — an older runtime writes to the wrong
+ ;; place rather than failing. Declare the floor so it refuses instead.
+ :jolt/min-version "0.8.0"
+
+ :paths ["clj"]
 
  ;; clojure.jdbc is the API this library exposes: the published library running on
  ;; the java.sql shim in db.jdbc-shim, rather than a reimplementation of it here.