diff --git a/rust/kernel/firmware.rs b/rust/kernel/firmware.rs
index 1abab5b2f052..94e6bb88b903 100644
--- a/rust/kernel/firmware.rs
+++ b/rust/kernel/firmware.rs
@@ -291,7 +291,7 @@ const fn push_module_name(self) -> Self {
         let module_name = this.module_name;
 
         if !this.module_name.is_empty() {
-            this = this.push_internal(module_name.as_bytes_with_nul());
+            this = this.push_internal(module_name.to_bytes_with_nul());
 
             if N != 0 {
                 // Re-use the space taken by the NULL terminator and swap it with the '.' separator.