diff --git a/Create-DevTerm-R01-OS-image-from-scratch.md b/Create-DevTerm-R01-OS-image-from-scratch.md
index 01619b7..c33e256 100644
--- a/Create-DevTerm-R01-OS-image-from-scratch.md
+++ b/Create-DevTerm-R01-OS-image-from-scratch.md
@@ -414,7 +414,7 @@ tar zxvf final_official_2.50.tar.gz
 cd WiringPi-final_official_2.50/
 cp ../DevTerm/Code/patch/d1/wiringCP0325.patch .
 git apply wiringCP0325.patch
-./build
+sudo ./build
 #Choice: 2
 
 ```
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