diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index b7f8bca1fd029da728ddab9db889a9725b67e599..58d0dd220324e89a3a1dfbc459182e32dcdf1e72 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -463,7 +463,6 @@ static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
                                 unsigned int size)
 {
     S390PCIBusDevice *pbdev = opaque;
-    uint32_t io_int_word;
     uint32_t idx = data >> ZPCI_MSI_VEC_BITS;
     uint32_t vec = data & ZPCI_MSI_VEC_MASK;
     uint64_t ind_bit;
@@ -489,8 +488,7 @@ static void s390_msi_ctrl_write(void *opaque, hwaddr addr, uint64_t data,
                    0x80 >> ((ind_bit + vec) % 8));
     if (!set_ind_atomic(pbdev->routes.adapter.summary_addr + sum_bit / 8,
                                        0x80 >> (sum_bit % 8))) {
-        io_int_word = (pbdev->isc << 27) | IO_INT_WORD_AI;
-        s390_io_interrupt(0, 0, 0, io_int_word);
+        css_adapter_interrupt(pbdev->isc);
     }
 }