diff --git a/cpukit/score/cpu/nios2/nios2-isr-is-in-progress.c b/cpukit/score/cpu/nios2/nios2-isr-is-in-progress.c
index 17eb8958a6..cb6ddb8c6a 100644
--- a/cpukit/score/cpu/nios2/nios2-isr-is-in-progress.c
+++ b/cpukit/score/cpu/nios2/nios2-isr-is-in-progress.c
@@ -20,7 +20,7 @@
 #include <rtems/score/nios2-utility.h>
 #include <rtems/score/percpu.h>
 
-bool _ISR_Is_in_progress( void )
+RTEMS_WEAK bool _ISR_Is_in_progress( void )
 {
   if ( _Nios2_Has_internal_interrupt_controller() ) {
     return _ISR_Nest_level != 0;