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-rw-r--r--cpukit/score/include/rtems/score/isr.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cpukit/score/include/rtems/score/isr.h b/cpukit/score/include/rtems/score/isr.h
index 97ffe7f2ec..617c7989ef 100644
--- a/cpukit/score/include/rtems/score/isr.h
+++ b/cpukit/score/include/rtems/score/isr.h
@@ -82,7 +82,7 @@ SCORE_EXTERN boolean _ISR_Signals_to_thread_executing;
* When this variable is zero, a thread is executing.
*/
-SCORE_EXTERN unsigned32 _ISR_Nest_level;
+SCORE_EXTERN volatile unsigned32 _ISR_Nest_level;
/*
* The following declares the Vector Table. Application