diff --git a/net/interfaces/interfaces_darwin_test.go b/net/interfaces/interfaces_darwin_test.go
index ec53a0833..6767ec614 100644
--- a/net/interfaces/interfaces_darwin_test.go
+++ b/net/interfaces/interfaces_darwin_test.go
@@ -5,6 +5,7 @@
 
 import (
 	"errors"
+	"io"
 	"net/netip"
 	"os/exec"
 	"testing"
@@ -69,6 +70,7 @@ func likelyHomeRouterIPDarwinExec() (ret netip.Addr, netif string, ok bool) {
 		return
 	}
 	defer cmd.Wait()
+	defer io.Copy(io.Discard, stdout) // clear the pipe to prevent hangs
 
 	var f []mem.RO
 	lineread.Reader(stdout, func(lineb []byte) error {