diff --git a/cpukit/score/cpu/m32r/cpu_asm.c b/cpukit/score/cpu/m32r/cpu_asm.c
index d47266b548..f808f42d06 100644
--- a/cpukit/score/cpu/m32r/cpu_asm.c
+++ b/cpukit/score/cpu/m32r/cpu_asm.c
@@ -28,6 +28,11 @@
 #include <rtems/system.h>
 #include <rtems/score/cpu.h>
 
+/*
+ * Prototypes
+ */
+void _ISR_Handler(void);
+
 /*  void __ISR_Handler()
  *
  *  This routine provides the RTEMS interrupt management.