diff --git a/Tests/NIOPosixTests/AsyncChannelBootstrapTests.swift b/Tests/NIOPosixTests/AsyncChannelBootstrapTests.swift
index 68604ef0f4f..7d365c36209 100644
--- a/Tests/NIOPosixTests/AsyncChannelBootstrapTests.swift
+++ b/Tests/NIOPosixTests/AsyncChannelBootstrapTests.swift
@@ -25,7 +25,8 @@ private final class IPHeaderRemoverHandler: ChannelInboundHandler {
 
     func channelRead(context: ChannelHandlerContext, data: NIOAny) {
         var data = Self.unwrapInboundIn(data)
-        assert(data.data.readIPv4Header() != nil)
+        let header = data.data.readIPv4Header()
+        assert(header != nil)
         context.fireChannelRead(Self.wrapInboundOut(data))
     }
 }