diff --git a/rust/helpers/of.c b/rust/helpers/of.c
index 86b51167c913..8f62ca69e8ba 100644
--- a/rust/helpers/of.c
+++ b/rust/helpers/of.c
@@ -2,7 +2,7 @@
 
 #include <linux/of.h>
 
-bool rust_helper_is_of_node(const struct fwnode_handle *fwnode)
+__rust_helper bool rust_helper_is_of_node(const struct fwnode_handle *fwnode)
 {
 	return is_of_node(fwnode);
 }