diff --git a/ci/build.sh b/ci/build.sh
index 8e3eed6..dd9819f 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -18,7 +18,7 @@ main() {
   PATH="${PATH}:$PWD/go/bin"
 
   cd "${ACTION_REPO_DIR}"
-  go mod edit -go "$(echo GO_VERSION | sed 's/^go//')"
+  go mod edit -go "$(echo "${GO_VERSION}" | sed 's/^go//')"
 
   # 3. Clone latest CoreDNS release
   cd "${TMPDIR}"