diff --git a/pvmfw/src/helpers.rs b/pvmfw/src/helpers.rs
index e6e3406..fddd8c3 100644
--- a/pvmfw/src/helpers.rs
+++ b/pvmfw/src/helpers.rs
@@ -113,3 +113,11 @@
     reg.zeroize();
     flush(reg)
 }
+
+/// Create &CStr out of &str literal
+#[macro_export]
+macro_rules! cstr {
+    ($str:literal) => {{
+        CStr::from_bytes_with_nul(concat!($str, "\0").as_bytes()).unwrap()
+    }};
+}