}
                if (fifo2 & 2) {
                        hc->hw.fifo_en &= ~HFCPCI_FIFOEN_B2;
-                       hc->hw.int_m1 &= ~(HFCPCI_INTS_B2TRANS +
+                       hc->hw.int_m1 &= ~(HFCPCI_INTS_B2TRANS |
                                           HFCPCI_INTS_B2REC);
                } else {
                        hc->hw.fifo_en &= ~HFCPCI_FIFOEN_B1;
-                       hc->hw.int_m1 &= ~(HFCPCI_INTS_B1TRANS +
+                       hc->hw.int_m1 &= ~(HFCPCI_INTS_B1TRANS |
                                           HFCPCI_INTS_B1REC);
                }
 #ifdef REVERSE_BITORDER
                if (fifo2 & 2) {
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2;
                        if (!tics)
-                               hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
+                               hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS |
                                                  HFCPCI_INTS_B2REC);
                        hc->hw.ctmt |= 2;
                        hc->hw.conn &= ~0x18;
                } else {
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1;
                        if (!tics)
-                               hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
+                               hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS |
                                                  HFCPCI_INTS_B1REC);
                        hc->hw.ctmt |= 1;
                        hc->hw.conn &= ~0x03;
                if (fifo2 & 2) {
                        hc->hw.last_bfifo_cnt[1] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2;
-                       hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
+                       hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS |
                                          HFCPCI_INTS_B2REC);
                        hc->hw.ctmt &= ~2;
                        hc->hw.conn &= ~0x18;
                } else {
                        hc->hw.last_bfifo_cnt[0] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1;
-                       hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
+                       hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS |
                                          HFCPCI_INTS_B1REC);
                        hc->hw.ctmt &= ~1;
                        hc->hw.conn &= ~0x03;