diff --git a/repos/libports/run/libc_filesystem_test.inc b/repos/libports/run/libc_filesystem_test.inc
index 17b48fe2b0..fb2625b52c 100644
--- a/repos/libports/run/libc_filesystem_test.inc
+++ b/repos/libports/run/libc_filesystem_test.inc
@@ -129,6 +129,19 @@ append config {
 
 install_config $config
 
+#
+# Prepare hard-disk image for test (used by Qemu or in RAM)
+#
+
+set disk_image "bin/test.hda"
+set cmd "dd if=/dev/zero of=$disk_image bs=1024 count=65536"
+puts "creating disk image: $cmd"
+catch { exec sh -c $cmd }
+
+set cmd "$mkfs_cmd $mkfs_opts $disk_image"
+puts "formating disk: $cmd"
+catch { exec sh -c $cmd }
+
 #
 # Boot modules
 #
@@ -152,19 +165,6 @@ append_platform_drv_boot_modules
 
 build_boot_image $boot_modules
 
-#
-# Execute test case
-#
-
-set disk_image "bin/test.hda"
-set cmd "dd if=/dev/zero of=$disk_image bs=1024 count=65536"
-puts "creating disk image: $cmd"
-catch { exec sh -c $cmd }
-
-set cmd "$mkfs_cmd $mkfs_opts $disk_image"
-puts "formating disk: $cmd"
-catch { exec sh -c $cmd }
-
 #
 # Qemu
 #