diff --git a/target/linux/brcm2708/image/gen_rpi_sdcard_img.sh b/target/linux/brcm2708/image/gen_rpi_sdcard_img.sh
index ffe01fa32..60b66c372 100755
--- a/target/linux/brcm2708/image/gen_rpi_sdcard_img.sh
+++ b/target/linux/brcm2708/image/gen_rpi_sdcard_img.sh
@@ -15,7 +15,7 @@ ROOTFSSIZE="$5"
 head=4
 sect=63
 
-set `ptgen -o $OUTPUT -h $head -s $sect -l 4096 -t c -p ${BOOTFSSIZE}M -t 83 -p ${ROOTFSSIZE}M`
+set $(ptgen -o $OUTPUT -h $head -s $sect -l 4096 -t c -p ${BOOTFSSIZE}M -t 83 -p ${ROOTFSSIZE}M)
 
 BOOTOFFSET="$(($1 / 512))"
 BOOTSIZE="$(($2 / 512))"