diff --git a/c/src/lib/libbsp/arm/gba/timer/timer.c b/c/src/lib/libbsp/arm/gba/timer/timer.c
index ee61df823d..f1135bc28d 100644
--- a/c/src/lib/libbsp/arm/gba/timer/timer.c
+++ b/c/src/lib/libbsp/arm/gba/timer/timer.c
@@ -55,7 +55,7 @@
  #define GBA_TM0CNT_PS    0x0003
 #endif
 
-rtems_boolean  Timer_driver_Find_average_overhead;
+bool Timer_driver_Find_average_overhead;
 
 /**
  *  @brief Timer_initialize start TM0 and TM1
@@ -143,7 +143,7 @@ rtems_status_code Empty_function( void )
  *  @param  find_flag boolean find_flag
  *  @return None
 */
-void Set_find_average_overhead(rtems_boolean find_flag)
+void Set_find_average_overhead(bool find_flag)
 {
    Timer_driver_Find_average_overhead = find_flag;
 }
diff --git a/c/src/lib/libbsp/arm/nds/timer/timer.c b/c/src/lib/libbsp/arm/nds/timer/timer.c
index 1ce26d29c4..f22915e8ac 100644
--- a/c/src/lib/libbsp/arm/nds/timer/timer.c
+++ b/c/src/lib/libbsp/arm/nds/timer/timer.c
@@ -15,7 +15,7 @@
 #include <bsp.h>
 #include <nds.h>
 
-rtems_boolean Timer_driver_Find_average_overhead;
+bool Timer_driver_Find_average_overhead;
 
 void
 Timer_initialize (void)
@@ -56,7 +56,7 @@ Empty_function (void)
 }
 
 void
-Set_find_average_overhead (rtems_boolean find_flag)
+Set_find_average_overhead (bool find_flag)
 {
   Timer_driver_Find_average_overhead = find_flag;
 }