diff --git a/portable/GCC/RX100/port.c b/portable/GCC/RX100/port.c
index a45b64661..e4cdbd7de 100644
--- a/portable/GCC/RX100/port.c
+++ b/portable/GCC/RX100/port.c
@@ -99,12 +99,12 @@ static void prvStartFirstTask( void ) __attribute__((naked));
  */
 #if ( configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H == 1 )
 
-    R_BSP_PRAGMA_INTERRUPT( vSoftwareInterruptISR, VECT( ICU, SWINT ) )
-    R_BSP_ATTRIB_INTERRUPT void vSoftwareInterruptISR( void ) __attribute__( ( naked ) );
+    R_BSP_PRAGMA_INTERRUPT( vPortSoftwareInterruptISR, VECT( ICU, SWINT ) )
+    R_BSP_ATTRIB_INTERRUPT void vPortSoftwareInterruptISR( void ) __attribute__( ( naked ) );
 
 #else /* configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H */
 
-    void vSoftwareInterruptISR( void ) __attribute__( ( naked ) );
+    void vPortSoftwareInterruptISR( void ) __attribute__( ( naked ) );
 
 #endif /* configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H  */
 
@@ -114,12 +114,12 @@ static void prvStartFirstTask( void ) __attribute__((naked));
  */
 #if ( configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H == 1 )
 
-    R_BSP_PRAGMA_INTERRUPT( vTickISR, _VECT( configTICK_VECTOR ) )
-    R_BSP_ATTRIB_INTERRUPT void vTickISR( void ); /* Do not add __attribute__( ( interrupt ) ). */
+    R_BSP_PRAGMA_INTERRUPT( vPortTickISR, _VECT( configTICK_VECTOR ) )
+    R_BSP_ATTRIB_INTERRUPT void vPortTickISR( void ); /* Do not add __attribute__( ( interrupt ) ). */
 
 #else /* configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H */
 
-    void vTickISR( void ) __attribute__( ( interrupt ) );
+    void vPortTickISR( void ) __attribute__( ( interrupt ) );
 
 #endif /* configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H */