diff --git a/pkgbuild.sh b/pkgbuild.sh
index b326377..5386f1b 100755
--- a/pkgbuild.sh
+++ b/pkgbuild.sh
@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 
 getInputs() {
-    gpgPrivateKey="$PLUGIN_GPGPRIVATEKEY"
-    gpgPublicKey="$PLUGIN_GPGPUBLICKEY"
-    gpgPassphrase="$PLUGIN_GPGPASSPHRASE"
-    pkgDir="$PLUGIN_PKGDIR"
+    gpgPrivateKey="${PLUGIN_GPGPRIVATEKEY:-}"
+    gpgPublicKey="${PLUGIN_GPGPUBLICKEY:-}"
+    gpgPassphrase="${PLUGIN_GPGPASSPHRASE:-}"
+    pkgDir="${PLUGIN_PKGDIR:-}"
 }
 
 addUser() {