diff --git a/debian/changelog b/debian/changelog
index e88e5220..743cd202 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -11,6 +11,7 @@ debian-cd (3.1.3) UNRELEASED; urgency=low
   * Only do boot disk stuff for x86 and alpha if the image is supposed to be
     bootable. Avoids downloading x86 D-I images for all 30+ CDs in a full set.
   * Don't download floppy D-I images for i386; they're no longer available.
+  * Don't fetch D-I images for the prep subarchitecture; it is not available.
 
   [ Steve McIntyre ]
   * Remove bashism in tools/apt-selection. Closes: #530972
diff --git a/tools/boot/lenny/boot-powerpc b/tools/boot/lenny/boot-powerpc
index 5e64e7c2..1effd23e 100755
--- a/tools/boot/lenny/boot-powerpc
+++ b/tools/boot/lenny/boot-powerpc
@@ -83,7 +83,7 @@ if [ -n "$KERNEL_PARAMS" ]; then
 fi
 cp $BASEDIR/data/$DI_CODENAME/yaboot/ofboot.b ofboot.b
 
-for subarch in powerpc powerpc64 prep
+for subarch in powerpc powerpc64 #prep
 do
   case $subarch in
     powerpc|prep)
diff --git a/tools/boot/squeeze/boot-powerpc b/tools/boot/squeeze/boot-powerpc
index 213028a6..25c74b65 100755
--- a/tools/boot/squeeze/boot-powerpc
+++ b/tools/boot/squeeze/boot-powerpc
@@ -83,7 +83,7 @@ if [ -n "$KERNEL_PARAMS" ]; then
 fi
 cp $BASEDIR/data/$DI_CODENAME/yaboot/ofboot.b ofboot.b
 
-for subarch in powerpc powerpc64 prep
+for subarch in powerpc powerpc64 #prep
 do
   case $subarch in
     powerpc|prep)