diff --git a/src/utils/iscsi.js b/src/utils/iscsi.js
index f62e0ab..281324e 100644
--- a/src/utils/iscsi.js
+++ b/src/utils/iscsi.js
@@ -614,6 +614,9 @@ class ISCSI {
       command = iscsi.options.paths.sudo;
     }
 
+    // ensure all args are converted to string values
+    args = args.map(String);
+
     // --name node.session.auth.password --value FOOBAR
     let argIndex;
     let cleansedArgs = [...args];
diff --git a/src/utils/kopia.js b/src/utils/kopia.js
index faad548..05dcf54 100644
--- a/src/utils/kopia.js
+++ b/src/utils/kopia.js
@@ -254,6 +254,9 @@ class Kopia {
       command = kopia.options.paths.sudo;
     }
 
+    // ensure all args are converted to string values
+    args = args.map(String);
+
     options.env = {
       ...{},
       ...process.env,