diff --git a/build.sh b/build.sh
index 6228e60..b7fada4 100755
--- a/build.sh
+++ b/build.sh
@@ -20,11 +20,13 @@ function install_dependencies {
 
 # prints the git tag corresponding to the newest and best matching the provided kernel version $1
 function get_tag {
-    local KERNEL_VERSION=$1
+    local KERNEL_VERSION="${1}"
 
     # list all tags from newest to oldest
-    (git --no-pager tag -l --sort=-creatordate | grep microvm-kernel-$KERNEL_VERSION\..*\.amzn2 \
-        || git --no-pager tag -l --sort=-creatordate | grep kernel-$KERNEL_VERSION\..*\.amzn2) | head -n1
+    {
+        git --no-pager tag -l --sort=-creatordate | grep "microvm-kernel-${KERNEL_VERSION}-.*\.amzn2" \
+        || git --no-pager tag -l --sort=-creatordate | grep "kernel-${KERNEL_VERSION}-.*\.amzn2"
+    } | head -n1
 }
 
 function build_version {