diff --git a/Sources/NIOCore/Channel.swift b/Sources/NIOCore/Channel.swift
index 73ed9362e4..4d3d664c14 100644
--- a/Sources/NIOCore/Channel.swift
+++ b/Sources/NIOCore/Channel.swift
@@ -458,8 +458,10 @@ extension ChannelError: CustomStringConvertible {
             "Bad interface address family"
         case let .illegalMulticastAddress(address):
             "Illegal multicast address \(address)"
+        #if !os(WASI)
         case let .multicastNotSupported(interface):
             "Multicast not supported on interface \(interface)"
+        #endif
         case .inappropriateOperationForState:
             "Inappropriate operation for state"
         case .unremovableHandler:
diff --git a/Sources/NIOFoundationCompat/WaitSpinningRunLoop.swift b/Sources/NIOFoundationCompat/WaitSpinningRunLoop.swift
index 9b9e16f955..bb390833f6 100644
--- a/Sources/NIOFoundationCompat/WaitSpinningRunLoop.swift
+++ b/Sources/NIOFoundationCompat/WaitSpinningRunLoop.swift
@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if !os(WASI)
+
 import Atomics
 import Foundation
 import NIOConcurrencyHelpers
@@ -70,3 +72,5 @@ extension EventLoopFuture {
         }
     }
 }
+
+#endif // !os(WASI)