diff --git a/raspi-config b/raspi-config
index 3817556..c9f7f00 100755
--- a/raspi-config
+++ b/raspi-config
@@ -549,7 +549,10 @@ set_camera() {
     sed /boot/config.txt -i -e "s/^fixup_file/#fixup_file/"
   else # enable camera
     set_config_var start_x 1 /boot/config.txt
-    set_config_var gpu_mem 128 /boot/config.txt
+    CUR_GPU_MEM=$(get_config_var gpu_mem /boot/config.txt)
+    if [ -z "$CUR_GPU_MEM" ] || [ "$CUR_GPU_MEM" -lt 128 ]; then
+      set_config_var gpu_mem 128 /boot/config.txt
+    fi
     sed /boot/config.txt -i -e "s/^startx/#startx/"
     sed /boot/config.txt -i -e "s/^fixup_file/#fixup_file/"
   fi