diff --git a/general/package/grainmedia-osdrv-gm8136/files/script/load_grainmedia b/general/package/grainmedia-osdrv-gm8136/files/script/load_grainmedia
index 0616b68d..485d702f 100755
--- a/general/package/grainmedia-osdrv-gm8136/files/script/load_grainmedia
+++ b/general/package/grainmedia-osdrv-gm8136/files/script/load_grainmedia
@@ -66,7 +66,7 @@ insmod gm2d.ko
 #insmod flcd200-pip.ko output_type=0 fb0_fb1_share=1 # CVBS display
 
 # check if /dev/sar_adc_drv exists, if not, load sar_adc module
-if [ ! -f /dev/sar_adc_drv ]; then
+if ! test -e /dev/sar_adc_drv ; then
     insmod sar_adc.ko run_mode=4                        #run_mode=4 is for CVBS out
 fi