diff --git a/bl32/tsp/tsp_main.c b/bl32/tsp/tsp_main.c
index 30bf6ff..0a81735 100644
--- a/bl32/tsp/tsp_main.c
+++ b/bl32/tsp/tsp_main.c
@@ -386,6 +386,14 @@
 	 */
 	tsp_get_magic(service_args);
 
+#if CTX_INCLUDE_MTE_REGS
+	/*
+	 * Write a dummy value to an MTE register, to simulate usage in the
+	 * secure world
+	 */
+	write_gcr_el1(0x99);
+#endif
+
 	/* Determine the function to perform based on the function ID */
 	switch (TSP_BARE_FID(func)) {
 	case TSP_ADD: