diff --git a/c/src/lib/libcpu/powerpc/ChangeLog b/c/src/lib/libcpu/powerpc/ChangeLog
index b9ae8f072d..9759a26e2d 100644
--- a/c/src/lib/libcpu/powerpc/ChangeLog
+++ b/c/src/lib/libcpu/powerpc/ChangeLog
@@ -1,3 +1,8 @@
+2007-12-10	Till Straumann <strauman@slac.stanford.edu>
+
+	* new-exceptions/bspsupport/nested_irq_test.c: adjusted
+	wrong irq name/number calculation.
+
 2007-12-10	Till Straumann <strauman@slac.stanford.edu>
 
 	* new-exceptions/bspsupport/ppc_exc_hdl.c: make sure
diff --git a/c/src/lib/libcpu/powerpc/new-exceptions/bspsupport/nested_irq_test.c b/c/src/lib/libcpu/powerpc/new-exceptions/bspsupport/nested_irq_test.c
index 999563d12a..45ec497bdc 100644
--- a/c/src/lib/libcpu/powerpc/new-exceptions/bspsupport/nested_irq_test.c
+++ b/c/src/lib/libcpu/powerpc/new-exceptions/bspsupport/nested_irq_test.c
@@ -99,7 +99,7 @@ rtems_irq_connect_data xx;
 	}
 	if ( inst ) {
 		openpic_maptimer( t, 1 );
-		openpic_inittimer( t, 8 + t, OPENPIC_VEC_SOURCE + xx.name );
+		openpic_inittimer( t, 8 + t, OPENPIC_VEC_SOURCE - BSP_PCI_IRQ_LOWEST_OFFSET + xx.name );
 		openpic_settimer( t, period, 1 );
 	}
 	return 0;