diff --git a/bl1/aarch32/bl1_context_mgmt.c b/bl1/aarch32/bl1_context_mgmt.c
index cbf5cb6..10c90f9 100644
--- a/bl1/aarch32/bl1_context_mgmt.c
+++ b/bl1/aarch32/bl1_context_mgmt.c
@@ -26,13 +26,13 @@
 static void *bl1_next_smc_context_ptr;
 
 /* Following functions are used for SMC context handling */
-void *smc_get_ctx(int security_state)
+void *smc_get_ctx(unsigned int security_state)
 {
 	assert(sec_state_is_valid(security_state));
 	return &bl1_smc_context[security_state];
 }
 
-void smc_set_next_ctx(int security_state)
+void smc_set_next_ctx(unsigned int security_state)
 {
 	assert(sec_state_is_valid(security_state));
 	bl1_next_smc_context_ptr = &bl1_smc_context[security_state];