diff --git a/src/iso.sh b/src/iso.sh
index 6c4ae17..4e5ac3b 100755
--- a/src/iso.sh
+++ b/src/iso.sh
@@ -30,7 +30,12 @@ LBA="$(dumpet -i Win*.iso \
 CDROM_SECTOR_SIZE=2048
 FLOPPY_SECTOR_SIZE=512
 
-dd if=Win*.iso bs=${CDROM_SECTOR_SIZE} skip=${LBA} count=1 > win.dmp
+dd \
+    if=`printf Win*.iso` \
+    bs=${CDROM_SECTOR_SIZE} \
+    skip=${LBA} \
+    count=1 \
+    > win.dmp
 FLOPPY_SECTORS="$(file win.dmp \
     | sed -e "s/.*sectors\ //" \
     | awk '{printf $1}')"
@@ -40,7 +45,7 @@ CDROM_SECTORS=`expr $FLOPPY_SECTOR_SIZE \
     / $CDROM_SECTOR_SIZE`
 
 dd \
-    if=Win*.iso \
+    if=`printf Win*.iso` \
     bs=${CDROM_SECTOR_SIZE} \
     skip=${LBA} \
     count=${CDROM_SECTORS} \