diff --git a/Flipcash/Core/Screens/Onramp/OnrampVerificationViewModel.swift b/Flipcash/Core/Screens/Onramp/OnrampVerificationViewModel.swift
index 0460e870..eca12ce6 100644
--- a/Flipcash/Core/Screens/Onramp/OnrampVerificationViewModel.swift
+++ b/Flipcash/Core/Screens/Onramp/OnrampVerificationViewModel.swift
@@ -87,6 +87,11 @@ final class OnrampVerificationViewModel<P: PhoneVerifying, E: EmailVerifying>: V
         }
     }
 
+    // `@_optimize(none)` skips the SIL optimizer for this deinit. Without it,
+    // Swift 6.3's `EarlyPerfInliner` crashes when checking layout-constraint
+    // compatibility through the generic parameters of this class on `-O`
+    // archive builds.
+    @_optimize(none)
     isolated deinit {
         let c = continuation
         continuation = nil