diff --git a/src/storage/storage_util.c b/src/storage/storage_util.c
index 41253b9a4c..bf6f0b31ef 100644
--- a/src/storage/storage_util.c
+++ b/src/storage/storage_util.c
@@ -1009,6 +1009,8 @@ storageBackendCreateQemuImgSetInput(virStorageVolDefPtr inputvol,
     info->inputFormat = inputvol->target.format;
     if (inputvol->type == VIR_STORAGE_VOL_BLOCK)
         info->inputFormat = VIR_STORAGE_FILE_RAW;
+    if (info->inputFormat == VIR_STORAGE_FILE_ISO)
+        info->inputFormat = VIR_STORAGE_FILE_RAW;
     if (!(info->inputFormatStr =
           virStorageFileFormatTypeToString(info->inputFormat))) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -1175,6 +1177,9 @@ virStorageBackendCreateQemuImgCmdFromVol(virConnectPtr conn,
     if (vol->type == VIR_STORAGE_VOL_BLOCK)
         info.format = VIR_STORAGE_FILE_RAW;
 
+    if (info.format == VIR_STORAGE_FILE_ISO)
+        info.format = VIR_STORAGE_FILE_RAW;
+
     if (!(type = virStorageFileFormatTypeToString(info.format))) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("unknown storage vol type %d"),