diff --git a/install_and_cache_pkgs.sh b/install_and_cache_pkgs.sh
index 28b3858..337628f 100755
--- a/install_and_cache_pkgs.sh
+++ b/install_and_cache_pkgs.sh
@@ -5,7 +5,7 @@ set -e
 
 # Include library.
 script_dir="$(dirname -- "$(realpath -- "${0}")")"
-source "${script_dir}/lib"
+source "${script_dir}/lib.sh"
 
 # Directory that holds the cached packages.
 cache_dir="${1}"
diff --git a/pre_cache_action.sh b/pre_cache_action.sh
index d1899f5..8c8f992 100755
--- a/pre_cache_action.sh
+++ b/pre_cache_action.sh
@@ -2,7 +2,7 @@
 
 # Include library.
 script_dir="$(dirname -- "$(realpath -- "${0}")")"
-source "${script_dir}/lib"
+source "${script_dir}/lib.sh"
 
 # Directory that holds the cached packages.
 cache_dir="${1}"