diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 72363238b8..a19902988c 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1550,7 +1550,7 @@ qemuBuildChardevCommand(virCommand *cmd,
 
 
 bool
-qemuDiskConfigBlkdeviotuneEnabled(virDomainDiskDef *disk)
+qemuDiskConfigBlkdeviotuneEnabled(const virDomainDiskDef *disk)
 {
     return !!disk->blkdeviotune.group_name ||
            virDomainBlockIoTuneInfoHasAny(&disk->blkdeviotune);
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 5fdb138030..55efa45601 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -208,7 +208,7 @@ qemuBuildZPCIDevProps(virDomainDeviceInfo *dev);
 int qemuNetworkPrepareDevices(virDomainDef *def);
 
 bool
-qemuDiskConfigBlkdeviotuneEnabled(virDomainDiskDef *disk);
+qemuDiskConfigBlkdeviotuneEnabled(const virDomainDiskDef *disk);
 
 virJSONValue *qemuBuildHotpluggableCPUProps(const virDomainVcpuDef *vcpu)
     ATTRIBUTE_NONNULL(1);