diff --git a/src/rust/protover/ffi.rs b/src/rust/protover/ffi.rs
index 780fe6963b..44c65114e3 100644
--- a/src/rust/protover/ffi.rs
+++ b/src/rust/protover/ffi.rs
@@ -204,7 +204,7 @@ pub extern "C" fn protover_is_supported_here(
         Err(_) => return 0,
     };
 
-    let is_supported = is_supported_here(protocol, version);
+    let is_supported = is_supported_here(&protocol, &version);
 
     return if is_supported { 1 } else { 0 };
 }