diff --git a/pre_cache_action.sh b/pre_cache_action.sh
index 0c23930..030f3b5 100755
--- a/pre_cache_action.sh
+++ b/pre_cache_action.sh
@@ -2,16 +2,16 @@
 
 set -e
 
+# Include library.
+script_dir="$(dirname -- "$(realpath -- "${0}")")"
+source "${script_dir}/lib.sh"
+
 # Debug mode for diagnosing issues.
 # Setup first before other operations.
 debug="${4}"
 validate_bool "${debug}" debug 1
 test ${debug} == "true" && set -x
 
-# Include library.
-script_dir="$(dirname -- "$(realpath -- "${0}")")"
-source "${script_dir}/lib.sh"
-
 # Directory that holds the cached packages.
 cache_dir="${1}"