diff --git a/Sources/OpenCombine/Helpers/Violations.swift b/Sources/OpenCombine/Helpers/Violations.swift
index c9f35f80..65712e8a 100644
--- a/Sources/OpenCombine/Helpers/Violations.swift
+++ b/Sources/OpenCombine/Helpers/Violations.swift
@@ -27,13 +27,6 @@ extension Subscribers.Demand {
     @_transparent
     @inline(__always)
     internal func assertNonZero() {
-        precondition(rawValue <= Subscribers.Demand.unlimited.rawValue)
-        precondition(rawValue > Subscribers.Demand.none.rawValue)
-    }
-
-    @_transparent
-    @inline(__always)
-    internal func assertValid() {
-        precondition(rawValue <= Subscribers.Demand.unlimited.rawValue)
+        precondition(rawValue != .zero)
     }
 }
diff --git a/Sources/OpenCombine/Publishers/Publishers.Zip.swift b/Sources/OpenCombine/Publishers/Publishers.Zip.swift
index 7c078944..ba241eee 100644
--- a/Sources/OpenCombine/Publishers/Publishers.Zip.swift
+++ b/Sources/OpenCombine/Publishers/Publishers.Zip.swift
@@ -599,7 +599,6 @@ private class AbstractZip<Input, Failure, Downstream> where Downstream: Subscrib
         let demand = pendingDemand
         pendingDemand = .none
         lock.unlock()
-        demand.assertValid()
         guard demand != .none, !subscriptions.isEmpty else {
             return
         }