diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index 446d9da..a05ee5a 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -69,7 +69,7 @@
 	uint32_t scr_el3;
 	el3_state_t *state;
 	gp_regs_t *gp_regs;
-	unsigned long sctlr_elx, actlr_elx;
+	u_register_t sctlr_elx, actlr_elx;
 
 	assert(ctx != NULL);