diff --git a/c/src/exec/score/cpu/unix/cpu.c b/c/src/exec/score/cpu/unix/cpu.c
index a8fa6bb4d3..af59fdbc72 100644
--- a/c/src/exec/score/cpu/unix/cpu.c
+++ b/c/src/exec/score/cpu/unix/cpu.c
@@ -40,7 +40,7 @@
 
 typedef struct {
   jmp_buf   regs;
-  unsigned32  isr_level;
+  int  isr_level;
 } Context_Control_overlay;
 
 void  _CPU_Signal_initialize(void);
diff --git a/cpukit/score/cpu/unix/cpu.c b/cpukit/score/cpu/unix/cpu.c
index a8fa6bb4d3..af59fdbc72 100644
--- a/cpukit/score/cpu/unix/cpu.c
+++ b/cpukit/score/cpu/unix/cpu.c
@@ -40,7 +40,7 @@
 
 typedef struct {
   jmp_buf   regs;
-  unsigned32  isr_level;
+  int  isr_level;
 } Context_Control_overlay;
 
 void  _CPU_Signal_initialize(void);