diff --git a/openbsc/src/libmsc/smpp_smsc.c b/openbsc/src/libmsc/smpp_smsc.c
index 048c1b8..c1ec22f 100644
--- a/openbsc/src/libmsc/smpp_smsc.c
+++ b/openbsc/src/libmsc/smpp_smsc.c
@@ -352,7 +352,13 @@
 	}
 	msgb_put(msg, rlen);
 
-	return osmo_wqueue_enqueue(&esme->wqueue, msg);
+	if (osmo_wqueue_enqueue(&esme->wqueue, msg) != 0) {
+		LOGP(DSMPP, LOGL_ERROR, "[%s] Write queue full. Dropping message\n",
+		     esme->system_id);
+		msgb_free(msg);
+		return -EAGAIN;
+	}
+	return 0;
 }
 
 /*! \brief transmit a generic NACK to a remote ESME */