diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 129ceca..4751314 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -6,6 +6,7 @@
 #ifndef PLAT_ARM_H
 #define PLAT_ARM_H
 
+#include <stdbool.h>
 #include <stdint.h>
 
 #include <drivers/arm/tzc_common.h>
@@ -222,7 +223,7 @@
 void arm_sp_min_plat_runtime_setup(void);
 
 /* FIP TOC validity check */
-int arm_io_is_toc_valid(void);
+bool arm_io_is_toc_valid(void);
 
 /* Utility functions for Dynamic Config */
 void arm_bl2_dyn_cfg_init(void);
@@ -254,7 +255,7 @@
 void plat_arm_interconnect_enter_coherency(void);
 void plat_arm_interconnect_exit_coherency(void);
 void plat_arm_program_trusted_mailbox(uintptr_t address);
-int plat_arm_bl1_fwu_needed(void);
+bool plat_arm_bl1_fwu_needed(void);
 __dead2 void plat_arm_error_handler(int err);
 
 /*