diff --git a/rust/helpers/cpufreq.c b/rust/helpers/cpufreq.c
index 7c1343c4d65e..0e16aeef2b5a 100644
--- a/rust/helpers/cpufreq.c
+++ b/rust/helpers/cpufreq.c
@@ -3,7 +3,8 @@
 #include <linux/cpufreq.h>
 
 #ifdef CONFIG_CPU_FREQ
-void rust_helper_cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
+__rust_helper void
+rust_helper_cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
 {
 	cpufreq_register_em_with_opp(policy);
 }