diff --git a/repos/base-foc/src/core/ipc_pager.cc b/repos/base-foc/src/core/ipc_pager.cc
index 30d9a7927..52a161130 100644
--- a/repos/base-foc/src/core/ipc_pager.cc
+++ b/repos/base-foc/src/core/ipc_pager.cc
@@ -135,7 +135,15 @@ void Ipc_pager::acknowledge_exception()
 {
 	memcpy(l4_utcb_exc(), &_regs, sizeof(l4_exc_regs_t));
 	l4_cap_idx_t dst = Fiasco::Capability::valid(_last.kcap) ? _last.kcap : L4_SYSF_REPLY;
-	l4_ipc_send(dst, l4_utcb(), l4_msgtag(0, L4_UTCB_EXCEPTION_REGS_SIZE, 0, 0), L4_IPC_SEND_TIMEOUT_0);
+	Fiasco::l4_msgtag_t const msg_tag =
+		l4_ipc_send(dst, l4_utcb(),
+		            l4_msgtag(0, L4_UTCB_EXCEPTION_REGS_SIZE, 0, 0),
+		            L4_IPC_SEND_TIMEOUT_0);
+
+	Fiasco::l4_umword_t const err = l4_ipc_error(msg_tag, l4_utcb());
+	if (err) {
+		warning("failed to acknowledge exception, l4_ipc_err=", err);
+	}
 }