diff --git a/plat/nvidia/tegra/soc/t186/plat_sip_calls.c b/plat/nvidia/tegra/soc/t186/plat_sip_calls.c
index bf98fcf..2e22123 100644
--- a/plat/nvidia/tegra/soc/t186/plat_sip_calls.c
+++ b/plat/nvidia/tegra/soc/t186/plat_sip_calls.c
@@ -60,7 +60,7 @@
 		     uint64_t x2,
 		     uint64_t x3,
 		     uint64_t x4,
-		     void *cookie,
+		     const void *cookie,
 		     void *handle,
 		     uint64_t flags)
 {