diff --git a/drivers/hwtracing/stm/policy.c b/drivers/hwtracing/stm/policy.c
index e8b50b1ac619..6c0ae2996326 100644
--- a/drivers/hwtracing/stm/policy.c
+++ b/drivers/hwtracing/stm/policy.c
@@ -341,7 +341,7 @@ stp_policies_make(struct config_group *group, const char *name)
 		return ERR_PTR(-EINVAL);
 	}
 
-	*p++ = '\0';
+	*p = '\0';
 
 	stm = stm_find_device(devname);
 	kfree(devname);