diff --git a/sh_script/pre-build.sh b/sh_script/pre-build.sh
index 21f37db..c742d1c 100755
--- a/sh_script/pre-build.sh
+++ b/sh_script/pre-build.sh
@@ -20,6 +20,11 @@ patch-ring() {
     pushd external/ring
     git reset --hard 464d367252354418a2c17feb806876d4d89a8508
     git clean -xdf
+
+    # apply the patch to get rid of unused import warning during compilation
+    # https://github.com/briansmith/ring/commit/c4742e0cae849f08ff410a817c5266af41670b3d
+    git cherry-pick c4742e0cae849f08ff410a817c5266af41670b3d
+
     case "$TARGET_OPTION" in
         "x86_64-unknown-none")
             git apply ../patches/ring/0001-Support-x86_64-unknown-none-target.patch