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-rwxr-xr-xscripts/mkimage.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/mkimage.sh b/scripts/mkimage.sh
index 07ff24b26f..14fa2a60fd 100755
--- a/scripts/mkimage.sh
+++ b/scripts/mkimage.sh
@@ -172,7 +172,7 @@ build_profile() {
if [ "$_dirty" = "yes" -o ! -e "$output_file" ]; then
# Create image
- output_format="${image_ext//[:\.]/}"
+ [ -n "$output_format" ] || output_format="${image_ext//[:\.]/}"
create_image_${output_format} || { _fail="yes"; false; }
if [ "$_checksum" = "yes" ]; then