diff --git a/app/src/store/views/buildSwapView.ts b/app/src/store/views/buildSwapView.ts
index a7f1aabe9..1ca7d15f5 100644
--- a/app/src/store/views/buildSwapView.ts
+++ b/app/src/store/views/buildSwapView.ts
@@ -493,7 +493,7 @@ class BuildSwapView {
             amount,
             quote,
             this.selectedChanIds,
-            deadline,
+            Math.round(deadline / 1000), // convert milli-secs to secs
             this.confTarget,
             this.loopOutAddress,
           );