diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
index 7a7e1ce3da89..5e2af8f81e2f 100644
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -204,8 +204,10 @@ tcp_detach(struct socket *so, struct inpcb *inp)
 			tcp_discardcb(tp);
 			in_pcbdetach(inp);
 			in_pcbfree(inp);
-		} else
+		} else {
 			in_pcbdetach(inp);
+			INP_WUNLOCK(inp);
+		}
 	}
 }